151-570: The Darent is a Kentish tributary of the River Thames and takes the waters of the River Cray as a tributary in the tidal portion of the Darent near Crayford. ' Darenth ' is frequently found as the spelling of the river's name in older books and maps, Bartholomew's Canals and River of England being one example. Bartholomew's Gazetteer (1954) demonstrates that Darent means "clear water",
302-445: A diurnal tide—one high and low tide each day. A "mixed tide"—two uneven magnitude tides a day—is a third regular category. Tides vary on timescales ranging from hours to years due to a number of factors, which determine the lunitidal interval . To make accurate records, tide gauges at fixed stations measure water level over time. Gauges ignore variations caused by waves with periods shorter than minutes. These data are compared to
453-423: A gunpowder mill .There were explosions here in 1745, 1790, 1795, 1796, 1799 and 1833. These killed at least forty people. Edsall went bankrupt in 1778 and the mills were purchased by Messrs Pigou and Andrews . The mill was a papermill by 1840, when William Wiggins was the owner. The malt mill was not required by Spilman, and he leased it to Godfrey Box of Liège. He erected an iron rolling and slitting mill (for
604-612: A cast iron waterwheel which drove three pairs of millstones. A steam engine provided auxiliary power. In 1894, roller milling plant was installed but milling ceased in 1905. The building was severely damaged in the Great Storm of 1987. TQ 558 714 Darenth Paper Mill was working until 1931 when it was taken over by Messrs Portals Ltd, of Laverstoke , Hampshire . In 1910, it was in the occupation of Messrs T H Saunders & Co Ltd, also at Hawley Mills and Beech and Rye Mills, High Wycombe , Buckinghamshire . The breast shot waterwheel
755-444: A chimney 230 feet (70 m) high, which is a listed building . The mill was last used as a factory and closed in 2003, with plans being put forward for conversion to housing use in 2005. The chimney dates to 1880. TQ 559 696 This corn mill was of the 19th century. The cast iron breast shot waterwheel was 10 feet (3.05 m) by 6 feet (1.83 m) carried on a 5 inches (130 mm) square axle. An unusual feature of this mill
906-467: A corn mill with two waterwheels. It was latterly used as a saw mill and burnt down on 7 January 1924. A picture of the mill can be seen here . The breastshot waterwheel remained in 1930. One waterwheel was of wood construction, driving three pairs of French Burr millstones and one pair of Peak millstones. The machinery was all wooden. The second waterwheel was of cast iron, driving two pairs of French Burr stones vis cast iron machinery. TQ 520 610 This
1057-677: A day were similar, but at springs the tides rose 7 feet (2.1 m) in the morning but 9 feet (2.7 m) in the evening. Pierre-Simon Laplace formulated a system of partial differential equations relating the ocean's horizontal flow to its surface height, the first major dynamic theory for water tides. The Laplace tidal equations are still in use today. William Thomson, 1st Baron Kelvin , rewrote Laplace's equations in terms of vorticity which allowed for solutions describing tidally driven coastally trapped waves, known as Kelvin waves . Others including Kelvin and Henri Poincaré further developed Laplace's theory. Based on these developments and
1208-523: A few days after (or before) new and full moon and are highest around the equinoxes, though Pliny noted many relationships now regarded as fanciful. In his Geography , Strabo described tides in the Persian Gulf having their greatest range when the moon was furthest from the plane of the Equator. All this despite the relatively small amplitude of Mediterranean basin tides. (The strong currents through
1359-672: A final two miles as a tidal estuary until it drops into the Thames at Long Reach . North of Dartford , the Darent is tidal and, just before entering the Thames, receives the waters of the River Cray at Dartford & Crayford Marshes where the rivers form administrative boundaries between Greater London and Kent , (specifically, the London Borough of Bexley and the Kentish borough of Dartford ). The Darent enters Long Reach to
1510-498: A forge here. The mill was rebuilt by Henry Hall in 1820 as a paper mill. Paper from this mill was used to print The Sphere and The Tatler ; photographs of the paper making process at the mill were used in the first edition of The Children's Encyclopedia . Henry Hall was the proprietor in 1840. An illustration of the machine house c.1880 can be seen here Archived 22 October 2007 at the Wayback Machine . The mill has
1661-577: A generating plant to provide electricity to Franks Hall . After it ceased to be used, the turbine is said to have been installed in Westminster Mill. TQ 560 685 This was a corn mill which stood upstream of the paper mill. Henry Knight was a miller in Horton who died in 1724 and Thomas Welch was a miller in Horton who died in 1734. George Cannon took the mill in the early 1830s. In 1843 he
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#17327653119041812-505: A given day are typically not the same height (the daily inequality); these are the higher high water and the lower high water in tide tables . Similarly, the two low waters each day are the higher low water and the lower low water . The daily inequality is not consistent and is generally small when the Moon is over the Equator . The following reference tide levels can be defined, from
1963-451: A gravitational field that varies in time and space is present. For example, the shape of the solid part of the Earth is affected slightly by Earth tide , though this is not as easily seen as the water tidal movements. Four stages in the tidal cycle are named: Oscillating currents produced by tides are known as tidal streams or tidal currents . The moment that the tidal current ceases
2114-541: A large part of south-eastern and a small part of western England; the river is fed by at least 50 named tributaries . The river contains over 80 islands . With its waters varying from freshwater to almost seawater, the Thames supports a variety of wildlife and has a number of adjoining Sites of Special Scientific Interest , with the largest being in the North Kent Marshes and covering 20.4 sq mi (5,289 ha). According to Mallory and Adams,
2265-475: A layshaft driven from the spur geared pitwheel. The mill was demolished in the 1930s. The paper mill had been run for over 200 years by the Wilmot family. TQ 531 648 Although it is said that this mill, which stood just downstream of Eynsford Bridge, was a corn mill with an undershot waterwheel other evidence shows this to have been a water powered saw mill which had been erected c. 1853. It may have stood on
2416-628: A modern zenith during the Industrial revolution and beyond. In 1835, almost 60,000 long tons (61,000 t) was carried in or out, servicing and supporting considerable industrial activity. Navigational factors meant that single cargoes were limited to 50 long tons (51 t) even on spring tides. A ship canal was proposed in the early 1800s but failed to achieve momentum. In 1839 a new proposal achieved an Act of Parliament allowing development to proceed and tolls were levied from completion in 1844. The work included straightening, dredging and shortening
2567-472: A monopoly for his paper by manipulating the favour and patronage of successive monarchs. Thomas Churchyard wrote a long poem in 1588, the first description of the papermaking process. Spielman employed 600 men, mainly Germans. The mills remained in the Spilman family until 1679, then a Mr Blackman was the owner in 1686 but he was bankrupt by 1739. Messrs. Pike and Edsall purchased the mill and converted it into
2718-508: A network of creeks. Lying below sea level, it is prone to flooding at exceptional tides, but has nevertheless been inhabited since Roman times. The usually quoted source of the Thames is at Thames Head (at grid reference ST980994 ). This is about 1.5 mi (2.4 km) north of the village of Kemble in southern Gloucestershire , near the town of Cirencester , in the Cotswolds . However, Seven Springs near Cheltenham , where
2869-536: A number of boreholes by the Environment Agency . This is documented in Dartford Library by Environment Agency documents lodged there. A sculpture, unveiled in 2004, celebrated the renewed life of the river, depicting the wildlife which has been saved. The River Darent powered a number of watermills . From source to mouth they are: TQ 444 537 The miller at this corn mill in 1771
3020-649: A number of self-seeded trees, lopped others and removed debris from the banks. The trust (termed Dartford and Crayford Restoration Trust) is an offshoot of the Northfleet Harbour Restoration Trust. In April 2015 a narrowboat arrived in Dartford Creek, with a crew of four canal skippers, to establish the feasibility of canal-boats visiting and by extension boats from the Medway , the non-tidal Thames and various sailing clubs along
3171-507: A paper mill in Bermondsey , then to a Mr Hall in St. Mary Cray when Dacie retired. In March 1832, Henry Sparks, papermaker of Sundridge was claiming relief for himself, wife Susanna and five children. He had been apprenticed to Messrs. Smith & Knight at Godalming in 1796, serving only four years. In May 1839, Henry Thomas, papermaker of Sundridge was claiming relief for himself. He had been
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#17327653119043322-493: A papermaker all his working life. The internal overshot waterwheel was 12 feet 6 inches (3.81 m) by 6 feet 3 inches (1.91 m), carried on an oak axle. Sundridge Mill produced paper for the Bank of England until its closure in 1901, business being transferred to Eynsford Paper Mill. The mill buildings were converted to a laundry, and the waterwheel was removed c. 1914 to be replaced by steam power. The mill
3473-516: A peppercorn rent to the Prioress of Dartford Nunnery. A wheat mill and a malt mill were released to one George Tasser in 1534. William Vaughan received them from the Crown in 1546 and the mills reverted to the Crown when he died in 1580. The two mills were granted to John Spilman (later Sir John Spilman) by the Crown in 1581. In 1588, Spilman converted the corn mill into a paper mill, and obtained
3624-410: A result of it springing from and running through chalk. The purity of the water was a major factor in the development of paper and pharmaceuticals in the area. Darenth Parish (through which the river flows) derives from a Celtic phrase 'stream where oak -trees grow' (Irish: "dair" = 'oak-tree', "abha" = river)(compare e.g." Derwent "). The landscapes of the valley were painted in a visionary manner by
3775-537: A set of pumps to supply Westerham. An average of 25,000 imperial gallons (110,000 L) could be supplied. The milling machinery was removed in 1936 and during the Second World War a doodlebug landed nearby and blew the roof of the mill off. The derelict building stood in April 1954, but had been demolished by July 1960. TQ 449 540 This corn mill had an external cast iron overshot waterwheel carried on
3926-557: A small building of 17 feet 6 inches (5.33 m) square and had been demolished by 1955. Little is known of the machinery except that the upright shaft was wooden and of 11.5 inches (290 mm) diameter. The wooden great spur wheel was of compass arm construction. TQ 461 535 This water powered pump was driven by a cast iron high breast shot waterwheel of 16 feet (4.88 m) by 3 feet 5 inches (1.04 m). A 6 feet (1.83 m) diameter cast iron spur geared pitwheel drove two ram pumps. The pump dated from 1858 and
4077-464: A smooth sphere covered by a sufficiently deep ocean under the tidal force of a single deforming body is a prolate spheroid (essentially a three-dimensional oval) with major axis directed toward the deforming body. Maclaurin was the first to write about the Earth's rotational effects on motion. Euler realized that the tidal force's horizontal component (more than the vertical) drives the tide. In 1744 Jean le Rond d'Alembert studied tidal equations for
4228-639: A summer venue for organised swimming, which is prohibited on safety grounds in a stretch centred on Central London . After the river took its present-day course, many of the banks of the Thames Estuary and the Thames Valley in London were partly covered in marshland , as was the adjoining Lower Lea Valley . Streams and rivers like the River Lea , Tyburn Brook and Bollo Brook drained into
4379-552: A surprise given the breadth of the valley it runs through. The "proto-Darent" was much larger than today's trickle but the River Medway , through erosion of the soft chalk and clays of the North Downs /Western Weald , has captured much of the headwaters which once supplied the Darent. In 1989, concerned individuals realised that almost all flow through Dartford had ceased. The River Darent was later recognised officially as
4530-463: A system of pulleys to add together six harmonic time functions. It was "programmed" by resetting gears and chains to adjust phasing and amplitudes. Similar machines were used until the 1960s. The first known sea-level record of an entire spring–neap cycle was made in 1831 on the Navy Dock in the Thames Estuary . Many large ports had automatic tide gauge stations by 1850. John Lubbock was one of
4681-480: A volunteer lengthsman Hugh Nesbitt. who is a skilled amateur archaeologist. In February 2016, Network Rail engineers removed trees at the top of Crayford Creek, re-establishing access to the "End of Navigation". Crayford Creek is considered capable of development for masted craft unable to proceed to Dartford because of Bob Dunn Bridge. Dartford library and museum provides a wealth of evidence that both creeks have been used for trade since pre-Roman times. Trade reached
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4832-466: A wooden axle. The mill was working up to the outbreak of the First World War and demolished in the 1930s. It had two pairs of millstones . TQ 447 532 Squerryes, or Spring Shaw Mill was a corn mill with a cast iron overshot waterwheel some 9 or 10 feet (2.74 or 3.05 m) diameter and 3 feet (0.91 m) wide. The mill was marked as disused on the 1895 6" Ordnance Survey map. It was
4983-471: Is a landmark on the Boat Race course, while Glover's Island forms the centre of a view from Richmond Hill . Islands of historical interest include Magna Carta Island at Runnymede , Fry's Island at Reading, and Pharaoh's Island near Shepperton. In more recent times Platts Eyot at Hampton was the place where Motor Torpedo Boats (MTB)s were built, Tagg's Island near Molesey was associated with
5134-722: Is a river that flows through southern England including London . At 215 miles (346 km), it is the longest river entirely in England and the second-longest in the United Kingdom , after the River Severn . The river rises at Thames Head in Gloucestershire and flows into the North Sea near Tilbury , Essex and Gravesend , Kent, via the Thames Estuary . From the west, it flows through Oxford (where it
5285-455: Is a useful concept. Tidal stage is also measured in degrees, with 360° per tidal cycle. Lines of constant tidal phase are called cotidal lines , which are analogous to contour lines of constant altitude on topographical maps , and when plotted form a cotidal map or cotidal chart . High water is reached simultaneously along the cotidal lines extending from the coast out into the ocean, and cotidal lines (and hence tidal phases) advance along
5436-402: Is an important water source, especially in the drier months, so maintaining its quality and quantity is extremely important. Groundwater is vulnerable to surface pollution, especially in highly urbanised areas. Brooks, canals and rivers, within an area of 3,842 sq mi (9,951 km ), combine to form 38 main tributaries feeding the Thames between its source and Teddington Lock . This
5587-422: Is at once cotidal with high and low waters, which is satisfied by zero tidal motion. (The rare exception occurs when the tide encircles an island, as it does around New Zealand, Iceland and Madagascar .) Tidal motion generally lessens moving away from continental coasts, so that crossing the cotidal lines are contours of constant amplitude (half the distance between high and low water) which decrease to zero at
5738-649: Is believed that Tamesubugus' name was derived from that of the river. Tamese was referred to as a place, not a river in the Ravenna Cosmography ( c. AD 700 ). The river's name has always been pronounced with a simple t /t/ ; the Middle English spelling was typically Temese and the Brittonic form Tamesis . A similar spelling from 1210, "Tamisiam" (the accusative case of "Tamisia"; see Kingston upon Thames § Early history ),
5889-418: Is called slack water or slack tide . The tide then reverses direction and is said to be turning. Slack water usually occurs near high water and low water, but there are locations where the moments of slack tide differ significantly from those of high and low water. Tides are commonly semi-diurnal (two high waters and two low waters each day), or diurnal (one tidal cycle per day). The two high waters on
6040-457: Is called the spring tide . It is not named after the season , but, like that word, derives from the meaning "jump, burst forth, rise", as in a natural spring . Spring tides are sometimes referred to as syzygy tides . When the Moon is at first quarter or third quarter, the Sun and Moon are separated by 90° when viewed from the Earth (in quadrature ), and the solar tidal force partially cancels
6191-604: Is formed for much of its length for shipping and supplies: through the Port of London for international trade, internally along its length and by its connection to the British canal system. The river's position has put it at the centre of many events in British history, leading to it being described by John Burns as "liquid history". Two broad canals link the river to other rivers: the Kennet and Avon Canal ( Reading to Bath ) and
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6342-697: Is found in Magna Carta . The Thames through Oxford is sometimes called the Isis . Historically, and especially in Victorian times, gazetteers and cartographers insisted that the entire river was correctly named the Isis from its source down to Dorchester on Thames and that only from this point, where the river meets the Thame and becomes the "Thame-isis" (supposedly subsequently abbreviated to Thames) should it be so called. Ordnance Survey maps still label
6493-446: Is never time for the fluid to "catch up" to the state it would eventually reach if the tidal force were constant—the changing tidal force nonetheless causes rhythmic changes in sea surface height. When there are two high tides each day with different heights (and two low tides also of different heights), the pattern is called a mixed semi-diurnal tide . The changing distance separating the Moon and Earth also affects tide heights. When
6644-408: Is not necessarily when the Moon is nearest to zenith or nadir , but the period of the forcing still determines the time between high tides. Because the gravitational field created by the Moon weakens with distance from the Moon, it exerts a slightly stronger than average force on the side of the Earth facing the Moon, and a slightly weaker force on the opposite side. The Moon thus tends to "stretch"
6795-461: Is not the case due to the free fall of the whole Earth, not only the oceans, towards these bodies) a different pattern of tidal forces would be observed, e.g. with a much stronger influence from the Sun than from the Moon: The solar gravitational force on the Earth is on average 179 times stronger than the lunar, but because the Sun is on average 389 times farther from the Earth, its field gradient
6946-452: Is responsible for managing the flow of water to help prevent and mitigate flooding, and providing for navigation: the volume and speed of water downstream is managed by adjusting the sluices at each of the weirs and, at peak high water, levels are generally dissipated over preferred flood plains adjacent to the river. Occasionally, flooding of inhabited areas is unavoidable and the agency issues flood warnings. Due to stiff penalties applicable on
7097-948: Is shared by many other river names in Britain, such as the River Tamar at the border of Devon and Cornwall , several rivers named Tame in the Midlands and North Yorkshire , the Tavy on Dartmoor , the Team of the North East, the Teifi and Teme of Wales , the Teviot in the Scottish Borders and a Thames tributary, the Thame . Kenneth H. Jackson proposed that the name of
7248-402: Is shorter than average, and stronger tidal currents than average. Neaps result in less extreme tidal conditions. There is about a seven-day interval between springs and neaps. Tidal constituents are the net result of multiple influences impacting tidal changes over certain periods of time. Primary constituents include the Earth's rotation, the position of the Moon and Sun relative to the Earth,
7399-558: Is sometimes called the Isis), Reading , Henley-on-Thames and Windsor . The Thames also drains the whole of Greater London . The lower reaches of the river are called the Tideway , derived from its long tidal reach up to Teddington Lock . Its tidal section includes most of its London stretch and has a rise and fall of 23 ft (7 m). From Oxford to the estuary, the Thames drops by 55 metres (180 ft). Running through some of
7550-419: Is the time required for the Earth to rotate once relative to the Moon. Simple tide clocks track this constituent. The lunar day is longer than the Earth day because the Moon orbits in the same direction the Earth spins. This is analogous to the minute hand on a watch crossing the hour hand at 12:00 and then again at about 1: 05 + 1 ⁄ 2 (not at 1:00). The Moon orbits the Earth in the same direction as
7701-404: Is the usual tidal limit ; however, high spring tides can raise the head water level in the reach above Teddington and can occasionally reverse the river flow for a short time. In these circumstances, tidal effects can be observed upstream to the next lock beside Molesey weir , which is visible from the towpath and bridge beside Hampton Court Palace . Before Teddington Lock was built in 1810–12,
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#17327653119047852-811: The Berwyn Mountains in North Wales . About 450,000 years ago, in the most extreme Ice Age of the Pleistocene , the Anglian , the furthest southern extent of the ice sheet reached Hornchurch in east London, the Vale of St Albans, and the Finchley Gap . It dammed the river in Hertfordshire , resulting in the formation of large ice lakes, which eventually burst their banks and caused
8003-541: The British Geological Survey from the banks of the tidal River Thames contain geochemical information and fossils which provide a 10,000-year record of sea-level change. Combined, this and other studies suggest that the Thames sea-level has risen more than 30 m during the Holocene at a rate of around 5–6 mm per year from 10,000 to 6,000 years ago. The rise of sea level dramatically reduced when
8154-570: The Churn (which feeds into the Thames near Cricklade ) rises, is also sometimes quoted as the Thames' source, as this location is farthest from the mouth and adds some 14 mi (23 km) to the river's length. At Seven Springs above the source is a stone with the Latin hexameter inscription "Hic tuus o Tamesine pater septemgeminus fons", which means "Here, O Father Thames, [is] your sevenfold source". The springs at Seven Springs flow throughout
8305-606: The Coriolis effect , is generally clockwise in the southern hemisphere and counterclockwise in the northern hemisphere. The difference of cotidal phase from the phase of a reference tide is the epoch . The reference tide is the hypothetical constituent "equilibrium tide" on a landless Earth measured at 0° longitude, the Greenwich meridian. In the North Atlantic, because the cotidal lines circulate counterclockwise around
8456-722: The Euripus Strait and the Strait of Messina puzzled Aristotle .) Philostratus discussed tides in Book Five of The Life of Apollonius of Tyana . Philostratus mentions the moon, but attributes tides to "spirits". In Europe around 730 AD, the Venerable Bede described how the rising tide on one coast of the British Isles coincided with the fall on the other and described the time progression of high water along
8607-684: The Grand Union Canal (London to the Midlands). The Grand Union effectively bypassed the earlier, narrow and winding Oxford Canal which remains open as a popular scenic recreational route. Three further cross-basin canals are disused but are in various stages of reconstruction: the Thames and Severn Canal (via Stroud ), which operated until 1927 (to the west coast of England), the Wey and Arun Canal to Littlehampton , which operated until 1871 (to
8758-474: The North Sea . Much later, in the late 20th century, geologists noticed tidal rhythmites , which document the occurrence of ancient tides in the geological record, notably in the Carboniferous . The tidal force produced by a massive object (Moon, hereafter) on a small particle located on or in an extensive body (Earth, hereafter) is the vector difference between the gravitational force exerted by
8909-489: The River Lea can be considered another boundary. Most of the local riverside was also marshland. The land was drained and became farmland; it was built on after the Industrial Revolution . Canvey Island in southern Essex (area 18.45 km , 7.12 sq mi; population 40,000 ) was once marshy, but is now a fully reclaimed island in the Thames estuary, separated from the mainland of south Essex by
9060-662: The Royal Academy , London , in 1785. They are now on show at the River and Rowing Museum in Henley). Richard Coates suggests that while the river was as a whole called the Thames, part of it, where it was too wide to ford, was called * (p)lowonida . This gave the name to a settlement on its banks, which became known as Londinium , from the Indo-European roots * pleu- "flow" and * -nedi "river" meaning something like
9211-441: The Thames Barrier , which protects central London from flooding by storm surges . Below the barrier, the river passes Woolwich , Thamesmead , Dagenham , Erith , Purfleet , Dartford , West Thurrock , Northfleet , Tilbury and Gravesend before entering the Thames Estuary near Southend-on-Sea . The sea level in the Thames estuary is rising and the rate of rise is increasing. Sediment cores up to 10 m deep collected by
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#17327653119049362-420: The Thanetian stage of the late Palaeocene epoch. Until around 500,000 years ago, the Thames flowed on its existing course through what is now Oxfordshire , before turning to the north-east through Hertfordshire and East Anglia and reaching the North Sea near present-day Ipswich . At this time the river-system headwaters lay in the English West Midlands and may, at times, have received drainage from
9513-440: The lunar theory of E W Brown describing the motions of the Moon, Arthur Thomas Doodson developed and published in 1921 the first modern development of the tide-generating potential in harmonic form: Doodson distinguished 388 tidal frequencies. Some of his methods remain in use. From ancient times, tidal observation and discussion has increased in sophistication, first marking the daily recurrence, then tides' relationship to
9664-412: The 'lowest flowing' river in the country. Wildlife was decimated but the reason became apparent as soon as the problem was addressed. Increasing quantities of water were being diverted by the then Rivers Authority to supply the growing greeds of adjacent towns and even London Boroughs. Since 1989, much work has been [claimed to have been] carried out to rectify this situation, including the shutting down of
9815-426: The 1890s but milling ceased in the 1920s. The mill building was standing in the 1980s. TQ 513 568 This was a corn mill rebuilt by Weeks of Maidstone in 1859, it had an internal cast iron overshot waterwheel 7 feet (2.13 m) by 12 feet (3.66 m), which had probably replaced a breast shot waterwheel of larger diameter. The waterwheel drove three pairs of millstones . Electricity replaced water power between
9966-434: The 1920s and the machinery was removed c. 1934. TQ 489 556 This was a paper mill. In December 1822 Nicholas Tapsfield, papermaker of Sundridge was claiming relief for himself and his wife Mary. He had been apprenticed at a paper mill at East Malling . In December 1831, Thomas Green, papermaker of Sundridge was claiming relief for himself, his wife and five children. He had been apprenticed in 1804 to William Dacie at
10117-428: The 20th century but was rebuilt. It was working until 1952 but has now been demolished. TQ 545 670 A mill has been on this site since Domesday. In the 15th century the mill was in the possession of the Roper family, Sir Anthony Roper being charged with "pulling down and allowing the watermill to decay and become uninhabited" in 1636. He was ordered to rebuild the mill within two years. The present building built by
10268-435: The Colyers dates to c.1780. The mill was a corn mill; the converted building survives. A curious feature is that the door on the north side of the east face is painted on, to look symmetrical with the real door. The mill was latterly worked by a turbine which drove a saw mill in its final years of operation. The mill last worked for trade in 1900. TQ 556 677 This installation was of the late 19th century. A turbine drove
10419-638: The Darent Valley Path to access or view the river's amenities, such as they are. This lack of attention is being addressed in the tidal section by a group of concerned locals, the "Friends of Dartford and Crayford Creeks". As of mid-2016, a trust was being formed to promote regeneration and give formal recognition to the protection of this valuable public amenity. Currently the tidal section is being furbished and improved by volunteers of "Friends of Dartford and Crayford Creek" to permit marine traffic, such as narrowboats and leisure cruisers to sail up to Steam Crane Wharf and beyond, to overnight or stay awhile. Much mud
10570-426: The Earth rotates on its axis, so it takes slightly more than a day—about 24 hours and 50 minutes—for the Moon to return to the same location in the sky. During this time, it has passed overhead ( culmination ) once and underfoot once (at an hour angle of 00:00 and 12:00 respectively), so in many places the period of strongest tidal forcing is the above-mentioned, about 12 hours and 25 minutes. The moment of highest tide
10721-419: The Earth slightly along the line connecting the two bodies. The solid Earth deforms a bit, but ocean water, being fluid, is free to move much more in response to the tidal force, particularly horizontally (see equilibrium tide ). As the Earth rotates, the magnitude and direction of the tidal force at any particular point on the Earth's surface change constantly; although the ocean never reaches equilibrium—there
10872-586: The Earth's accumulated dynamic tidal response to the applied forces, which response is influenced by ocean depth, the Earth's rotation, and other factors. In 1740, the Académie Royale des Sciences in Paris offered a prize for the best theoretical essay on tides. Daniel Bernoulli , Leonhard Euler , Colin Maclaurin and Antoine Cavalleri shared the prize. Maclaurin used Newton's theory to show that
11023-427: The Moon and its phases. Bede starts by noting that the tides rise and fall 4/5 of an hour later each day, just as the Moon rises and sets 4/5 of an hour later. He goes on to emphasise that in two lunar months (59 days) the Moon circles the Earth 57 times and there are 114 tides. Bede then observes that the height of tides varies over the month. Increasing tides are called malinae and decreasing tides ledones and that
11174-459: The Moon is closest, at perigee , the range increases, and when it is at apogee , the range shrinks. Six or eight times a year perigee coincides with either a new or full moon causing perigean spring tides with the largest tidal range . The difference between the height of a tide at perigean spring tide and the spring tide when the moon is at apogee depends on location but can be large as a foot higher. These include solar gravitational effects,
11325-462: The Moon on the particle, and the gravitational force that would be exerted on the particle if it were located at the Earth's center of mass. Whereas the gravitational force subjected by a celestial body on Earth varies inversely as the square of its distance to the Earth, the maximal tidal force varies inversely as, approximately, the cube of this distance. If the tidal force caused by each body were instead equal to its full gravitational force (which
11476-457: The Moon's altitude (elevation) above the Earth's Equator, and bathymetry . Variations with periods of less than half a day are called harmonic constituents . Conversely, cycles of days, months, or years are referred to as long period constituents. Tidal forces affect the entire earth , but the movement of solid Earth occurs by mere centimeters. In contrast, the atmosphere is much more fluid and compressible so its surface moves by kilometers, in
11627-449: The Moon's tidal force. At these points in the lunar cycle, the tide's range is at its minimum; this is called the neap tide , or neaps . "Neap" is an Anglo-Saxon word meaning "without the power", as in forðganges nip (forth-going without-the-power). Neap tides are sometimes referred to as quadrature tides . Spring tides result in high waters that are higher than average, low waters that are lower than average, " slack water " time that
11778-449: The Moon. Abu Ma'shar discussed the effects of wind and Moon's phases relative to the Sun on the tides. In the 12th century, al-Bitruji (d. circa 1204) contributed the notion that the tides were caused by the general circulation of the heavens. Simon Stevin , in his 1608 De spiegheling der Ebbenvloet ( The theory of ebb and flood ), dismissed a large number of misconceptions that still existed about ebb and flood. Stevin pleaded for
11929-736: The North Sea, and the Thames Barrier was built in the 1980s to protect London from this risk. The Nore is the sandbank that marks the mouth of the Thames Estuary , where the outflow from the Thames meets the North Sea . It is roughly halfway between Havengore Creek in Essex and Warden Point on the Isle of Sheppey in Kent. Until 1964 it marked the seaward limit of the Port of London Authority. As
12080-632: The Northumbrian coast. The first tide table in China was recorded in 1056 AD primarily for visitors wishing to see the famous tidal bore in the Qiantang River . The first known British tide table is thought to be that of John Wallingford, who died Abbot of St. Albans in 1213, based on high water occurring 48 minutes later each day, and three hours earlier at the Thames mouth than upriver at London . In 1614 Claude d'Abbeville published
12231-605: The River Thames on the Tideway include the rivers Crane , Brent , Wandle , Ravensbourne (the final part of which is called Deptford Creek ), Lea (the final part of which is called Bow Creek ), Roding (Barking Creek), Darent and Ingrebourne . In London, the water is slightly brackish with sea salt, being a mix of sea and fresh water. This part of the river is managed by the Port of London Authority . The flood threat here comes from high tides and strong winds from
12382-531: The Sun and moon. Pytheas travelled to the British Isles about 325 BC and seems to be the first to have related spring tides to the phase of the moon. In the 2nd century BC, the Hellenistic astronomer Seleucus of Seleucia correctly described the phenomenon of tides in order to support his heliocentric theory. He correctly theorized that tides were caused by the moon , although he believed that
12533-480: The Thames Estuary), the river is subject to tidal activity from the North Sea . Before the lock was installed, the river was tidal as far as Staines, about 16 mi (26 km) upstream. London, capital of Roman Britain , was established on two hills, now known as Cornhill and Ludgate Hill . These provided a firm base for a trading centre at the lowest possible point on the Thames. A river crossing
12684-521: The Thames as "River Thames or Isis" down to Dorchester. Since the early 20th century this distinction has been lost in common usage outside of Oxford, and some historians suggest the name Isis is nothing more than a truncation of Tamesis , the Latin name for the Thames. Sculptures titled Tamesis and Isis by Anne Seymour Damer are located on the bridge at Henley-on-Thames , Oxfordshire (the original terracotta and plaster models were exhibited at
12835-475: The Thames estuary. This was the first time in over forty years that a registered ship lay over in Dartford Creek. Pentargon (SSR160910) returned in June 2015, familiarising more canalboat skippers, and stayed until October. Weeks of tide-waiting established a 'sailor's knowledge base' for future visits. During the period, the boat rested on a berm near the lock, accessible only at spring tides . Upon its departure,
12986-493: The Thames is not Indo-European (and of unknown meaning), while Peter Kitson suggested that it is Indo-European but originated before the Britons and has a name indicating "muddiness" from a root *tā- , 'melt'. Early variants of the name include: Indirect evidence for the antiquity of the name "Thames" is provided by a Roman potsherd found at Oxford, bearing the inscription Tamesubugus fecit (Tamesubugus made [this]). It
13137-567: The Thames, from Middle English Temese , is derived from the Brittonic name for the river, Tamesas (from * tamēssa ), recorded in Latin as Tamesis and yielding modern Welsh Tafwys "Thames". The name element Tam may have meant "dark" and can be compared to other cognates such as Russian темно ( Proto-Slavic * tĭmĭnŭ ), Lithuanian tamsi "dark", Latvian tumsa "darkness", Sanskrit tamas and Welsh tywyll "darkness" and Middle Irish teimen "dark grey". The origin
13288-531: The Two Chief World Systems , whose working title was Dialogue on the Tides , gave an explanation of the tides. The resulting theory, however, was incorrect as he attributed the tides to the sloshing of water caused by the Earth's movement around the Sun. He hoped to provide mechanical proof of the Earth's movement. The value of his tidal theory is disputed. Galileo rejected Kepler's explanation of
13439-624: The Victorian artist Samuel Palmer during the mid-1800s. Fed by springs from the greensand hills south of Westerham in Kent and below Limpsfield Chart in Surrey , the Darent flows 21 miles (34 km) east then north by Otford and Shoreham , past the castle and the ruined Roman villa at Lullingstone , then by Eynsford , Farningham , Horton Kirby , South Darenth , Sutton-at-Hone , Darenth , and eventually to Dartford , whence it proceeds
13590-423: The amphidromic point, the high tide passes New York Harbor approximately an hour ahead of Norfolk Harbor. South of Cape Hatteras the tidal forces are more complex, and cannot be predicted reliably based on the North Atlantic cotidal lines. Investigation into tidal physics was important in the early development of celestial mechanics , with the existence of two daily tides being explained by the Moon's gravity. Later
13741-429: The amphidromic point. For a semi-diurnal tide the amphidromic point can be thought of roughly like the center of a clock face, with the hour hand pointing in the direction of the high water cotidal line, which is directly opposite the low water cotidal line. High water rotates about the amphidromic point once every 12 hours in the direction of rising cotidal lines, and away from ebbing cotidal lines. This rotation, caused by
13892-547: The atmosphere which did not include rotation. In 1770 James Cook 's barque HMS Endeavour grounded on the Great Barrier Reef . Attempts were made to refloat her on the following tide which failed, but the tide after that lifted her clear with ease. Whilst she was being repaired in the mouth of the Endeavour River Cook observed the tides over a period of seven weeks. At neap tides both tides in
14043-659: The case of the Colne ), and man-made distributaries such as the Longford River . Three canals intersect this stretch: the Oxford Canal , Kennet and Avon Canal and Wey Navigation . Its longest artificial secondary channel (cut), the Jubilee River , was built between Maidenhead and Windsor for flood relief and completed in 2002. The non-tidal section of the river is managed by the Environment Agency , which
14194-410: The coast. Semi-diurnal and long phase constituents are measured from high water, diurnal from maximum flood tide. This and the discussion that follows is precisely true only for a single tidal constituent. For an ocean in the shape of a circular basin enclosed by a coastline, the cotidal lines point radially inward and must eventually meet at a common point, the amphidromic point . The amphidromic point
14345-566: The combined effects of the gravitational forces exerted by the Moon (and to a much lesser extent, the Sun ) and are also caused by the Earth and Moon orbiting one another. Tide tables can be used for any given locale to find the predicted times and amplitude (or " tidal range "). The predictions are influenced by many factors including the alignment of the Sun and Moon, the phase and amplitude of
14496-476: The confluence, the overall length of the Thames measured from Seven Springs, at 229 mi (369 km), is greater than the Severn's length of 220 mi (350 km). Thus, the "Churn/Thames" river may be regarded as the longest natural river in the United Kingdom. The stream from Seven Springs is joined at Coberley by a longer tributary which could further increase the length of the Thames, with its source in
14647-480: The daily tides were explained more precisely by the interaction of the Moon's and the Sun's gravity. Seleucus of Seleucia theorized around 150 BC that tides were caused by the Moon. The influence of the Moon on bodies of water was also mentioned in Ptolemy 's Tetrabiblos . In De temporum ratione ( The Reckoning of Time ) of 725 Bede linked semidurnal tides and the phenomenon of varying tidal heights to
14798-516: The drier parts of mainland Britain and heavily abstracted for drinking water, the Thames' discharge is low considering its length and breadth: the Severn has a discharge almost twice as large on average despite having a smaller drainage basin . In Scotland , the Tay achieves more than double the Thames' average discharge from a drainage basin that is 60% smaller. Along its course are 45 navigation locks with accompanying weirs . Its catchment area covers
14949-540: The east of Crayford Ness. Kent County Council has signposted a 19-mile (31 km) walking route along the Darent between the Greensand Hills above Sevenoaks and the Thames and named it the Darent Valley Path . The route receives no obvious attention from councils or 'focus' groups although all or part is used by joggers, cyclists, walkers, dog walkers and curious adventurers, availing themselves of
15100-410: The feasibility of both creeks for access and dallying by a range of craft had been established. Pentargon was the first boat to undertake an overnight stay in the creek with crew on board since the late 1970s. To facilitate her tying up on first arrival volunteers dug away forty years of neglect and inertia to provide a clean quayside and temporary mooring in the lock. This work was extended in 2016 by
15251-538: The first to map co-tidal lines, for Great Britain, Ireland and adjacent coasts, in 1840. William Whewell expanded this work ending with a nearly global chart in 1836. In order to make these maps consistent, he hypothesized the existence of a region with no tidal rise or fall where co-tidal lines meet in the mid-ocean. The existence of such an amphidromic point , as they are now known, was confirmed in 1840 by Captain William Hewett, RN , from careful soundings in
15402-475: The flowing river or the wide flowing unfordable river. The river gives its name to three informal areas: the Thames Valley , a region of England around the river between Oxford and West London; the Thames Gateway ; and the greatly overlapping Thames Estuary around the tidal Thames to the east of London and including the waterway itself. Thames Valley Police is a formal body that takes its name from
15553-456: The ford existed even before the Roman period. Tarentefort itself flourished through the Roman period AD50 - AD 450. A ferry controlled by a hermit was established c.1235 and survived until 1518, long after the first bridge was constructed during the reign of Henry IV (1399–1413). That bridge survived into the 1700s. Today's river is not much more than a stream apart from in conditions of spate,
15704-663: The grounds of the National Star College at Ullenwood . The Thames flows through or alongside Ashton Keynes , Cricklade , Lechlade , Oxford , Abingdon-on-Thames , Wallingford , Goring-on-Thames and Streatley (at the Goring Gap ), Pangbourne and Whitchurch-on-Thames , Reading , Wargrave , Henley-on-Thames , Marlow , Maidenhead , Windsor and Eton , Staines-upon-Thames and Egham , Chertsey , Shepperton , Weybridge , Sunbury-on-Thames , Walton-on-Thames , Molesey and Thames Ditton . The river
15855-420: The highest level to the lowest: The semi-diurnal range (the difference in height between high and low waters over about half a day) varies in a two-week cycle. Approximately twice a month, around new moon and full moon when the Sun, Moon, and Earth form a line (a configuration known as a syzygy ), the tidal force due to the Sun reinforces that due to the Moon. The tide's range is then at its maximum; this
16006-512: The ice melt nearly concluded over the past 4,000 years. Since the beginning of the 20th century, rates of sea level rise range from 1.22 mm per year to 2.14 mm per year. The Thames River Basin District, including the Medway catchment, covers an area of 6,229 sq mi (16,130 km ). The entire river basin is a mixture of urban and rural, with rural landscape predominating in
16157-415: The idea that the attraction of the Moon was responsible for the tides and spoke in clear terms about ebb, flood, spring tide and neap tide , stressing that further research needed to be made. In 1609 Johannes Kepler also correctly suggested that the gravitation of the Moon caused the tides, which he based upon ancient observations and correlations. Galileo Galilei in his 1632 Dialogue Concerning
16308-579: The impresario Fred Karno and Eel Pie Island at Twickenham was the birthplace of the South East's R&B music scene. Westminster Abbey and the Palace of Westminster (commonly known today as the Houses of Parliament ) were built on Thorney Island , which used to be an eyot . Researchers have identified the River Thames as a discrete drainage line flowing as early as 58 million years ago, in
16459-468: The interaction was mediated by the pneuma . He noted that tides varied in time and strength in different parts of the world. According to Strabo (1.1.9), Seleucus was the first to link tides to the lunar attraction, and that the height of the tides depends on the moon's position relative to the Sun. The Naturalis Historia of Pliny the Elder collates many tidal observations, e.g., the spring tides are
16610-464: The manufacture of nails; the first in England) between 1590 and 1595, which by 1758 had two waterwheels, one working the upper roller, the other working the lower rollers and a guillotine. A company of "white paper makers" was established here in 1694 and during the 18th century the mill was owned by a Mr Quelch. Approximately TQ 548 728 The Powder Mills were in operation from c. 1730, possibly on
16761-453: The milling trade at his mill. Stephen Cannon later bought the mill and it passed to his daughter Harriet on his death on 27 February 1856. The mill remained in the Cannon family until 1872, and the mill house until 1888. Latterly the mill had a steam engine and a tall chimney. During the First World War, a bomb hit the mill, but did not explode, although the mill was put out of action. The mill
16912-412: The month is divided into four parts of seven or eight days with alternating malinae and ledones . In the same passage he also notes the effect of winds to hold back tides. Bede also records that the time of tides varies from place to place. To the north of Bede's location ( Monkwearmouth ) the tides are earlier, to the south later. He explains that the tide "deserts these shores in order to be able all
17063-514: The more to be able to flood other [shores] when it arrives there" noting that "the Moon which signals the rise of tide here, signals its retreat in other regions far from this quarter of the heavens". Later medieval understanding of the tides was primarily based on works of Muslim astronomers , which became available through Latin translation starting from the 12th century. Abu Ma'shar al-Balkhi (d. circa 886), in his Introductorium in astronomiam , taught that ebb and flood tides were caused by
17214-515: The navigation. On Dartford Creek, close to its junction with the Thames, is the Dartford Creek Tidal Flood Barrier with two 160-tonne (160-long-ton) drop-leaf gates, which may be lowered if the sea threatens to inundate the land. The barrier is managed by the Environment Agency . Dartford ( Domesday Book "Tarentefort") was a major fording place on Watling Street. Research by Woodlands Junior School indicates that
17365-426: The non-tidal river, which is a drinking water source before treatment, sanitary sewer overflow from the many sewage treatment plants covering the upper Thames basin should be rare in the non-tidal Thames. However, storm sewage overflows are still common in almost all the main tributaries of the Thames despite claims by Thames Water to the contrary. Below Teddington Lock (about 55 mi or 89 km upstream of
17516-420: The obliquity (tilt) of the Earth's Equator and rotational axis, the inclination of the plane of the lunar orbit and the elliptical shape of the Earth's orbit of the Sun. A compound tide (or overtide) results from the shallow-water interaction of its two parent waves. Because the M 2 tidal constituent dominates in most locations, the stage or phase of a tide, denoted by the time in hours after high water,
17667-408: The problem from the perspective of a static system (equilibrium theory), that provided an approximation that described the tides that would occur in a non-inertial ocean evenly covering the whole Earth. The tide-generating force (or its corresponding potential ) is still relevant to tidal theory, but as an intermediate quantity (forcing function) rather than as a final result; theory must also consider
17818-412: The reference (or datum) level usually called mean sea level . While tides are usually the largest source of short-term sea-level fluctuations, sea levels are also subject to change from thermal expansion , wind, and barometric pressure changes, resulting in storm surges , especially in shallow seas and near coasts. Tidal phenomena are not limited to the oceans, but can occur in other systems whenever
17969-585: The river passes Pimlico and Vauxhall , and then forms one of the principal axes of the city, from the Palace of Westminster to the Tower of London . At this point, it historically formed the southern boundary of the medieval city, with Southwark , on the opposite bank, then being part of Surrey . Beyond central London, the river passes Bermondsey , Wapping , Shadwell , Limehouse , Rotherhithe , Millwall , Deptford , Greenwich , Cubitt Town , Blackwall , New Charlton and Silvertown , before flowing through
18120-502: The river to divert onto its present course through the area of present-day London. The ice lobe which stopped at present-day Finchley deposited about 14 metres of boulder clay there. Its torrent of meltwater gushed through the Finchley Gap and south towards the new course of the Thames, and proceeded to carve out the Brent Valley in the process. Spring tides Tides are the rise and fall of sea levels caused by
18271-439: The river was tidal at peak spring tides as far as Staines upon Thames . In descending order, non-related tributaries of the non-tidal Thames, with river status, are the Churn , Leach , Cole , Ray , Coln , Windrush , Evenlode , Cherwell , Ock , Thame , Pang , Kennet , Loddon , Colne , Wey and Mole . In addition, there are occasional backwaters and artificial cuts that form islands, distributaries (most numerous in
18422-596: The river, covering three counties . In non-administrative use, the river's name is used in those of Thames Valley University , Thames Water , Thames Television , publishing company Thames & Hudson , Thameslink (north–south rail service passing through central London ) and South Thames College . An example of its use in the names of historic entities is the Thames Ironworks and Shipbuilding Company . Marks of human activity, in some cases dating back to Pre-Roman Britain , are visible at various points along
18573-399: The river, while some islands, e.g. Thorney Island , formed over the ages. The northern tip of the ancient parish of Lambeth , for example, was marshland known as Lambeth Marshe , but it was drained in the 18th century; the street names Lower Marsh and Upper Marsh preserve a memory. Until the middle of the Victorian era, malaria was commonplace beside the River Thames, even in London, and
18724-467: The river. These include a variety of structures connected with use of the river, such as navigations, bridges and watermills , as well as prehistoric burial mounds . The lower Thames in the Roman era was a shallow waterway winding through marshes. But centuries of human intervention have transformed it into a deep tidal canal flowing between 200 miles of solid walls; these defend a floodplain where 1.5 million people work and live. A major maritime route
18875-611: The sandbank was a major hazard for shipping coming in and out of London, in 1732 it received the world's first lightship . This became a major landmark, and was used as an assembly point for shipping. Today it is marked by Sea Reach No. 1 Buoy. The River Thames contains over 80 islands ranging from the large estuarial marshlands of the Isle of Sheppey and Canvey Island to small tree-covered islets like Rose Isle in Oxfordshire and Headpile Eyot in Berkshire. They are found all
19026-448: The sense of the contour level of a particular low pressure in the outer atmosphere. In most locations, the largest constituent is the principal lunar semi-diurnal , also known as the M2 tidal constituent or M 2 tidal constituent . Its period is about 12 hours and 25.2 minutes, exactly half a tidal lunar day , which is the average time separating one lunar zenith from the next, and thus
19177-474: The site of Spilman's paper mill of 1588. It was in operation until the 20th century. TQ 547 732 Lower Mill was built in the mid-17th century, and closed in 1790. Later it was used as a zinc rolling mill and a printing works for silk and calico. TQ 545 739 River Thames The River Thames ( / t ɛ m z / TEMZ ), known alternatively in parts as the River Isis ,
19328-414: The site of an earlier mill. TQ 540 656 This was a corn mill. It stands immediately downstream of the bridge by Eynsford ford . The low breast shot waterwheel was 8 feet (2.44 m) diameter in 1887, being replaced by one of at least 10 feet (3.05 m) diameter. It was 10 feet (3.05 m) wide. The millstones were only 3 feet (910 mm) diameter, suggesting that only a limited amount of flour
19479-541: The south coast), and the Wilts & Berks Canal . Rowing and sailing clubs are common along the Thames, which is navigable to such vessels. Kayaking and canoeing also take place. Major annual events include the Henley Royal Regatta and the Boat Race , while the Thames has been used during two Summer Olympic Games : 1908 ( rowing ) and 1948 ( rowing and canoeing ). Safe headwaters and reaches are
19630-404: The tide (pattern of tides in the deep ocean), the amphidromic systems of the oceans, and the shape of the coastline and near-shore bathymetry (see Timing ). They are however only predictions, the actual time and height of the tide is affected by wind and atmospheric pressure . Many shorelines experience semi-diurnal tides—two nearly equal high and low tides each day. Other locations have
19781-494: The tides. Isaac Newton (1642–1727) was the first person to explain tides as the product of the gravitational attraction of astronomical masses. His explanation of the tides (and many other phenomena) was published in the Principia (1687) and used his theory of universal gravitation to explain the lunar and solar attractions as the origin of the tide-generating forces. Newton and others before Pierre-Simon Laplace worked
19932-455: The wars, and the mill last worked in 1947. The stones of the mill were said to have been caused to run backwards at one time through the mill being bewitched. The mill drove three pairs of millstones, the machinery being mostly of cast iron. The mill building survived until 1987 when the site was redeveloped. TQ 524 594 There was a watermill in Otford in 1541. The last mill on this site was
20083-476: The waterwheel was replaced by a turbine and the mill generated electricity. The mill burnt down when struck by lightning in 1908 and was rebuilt as a factory which made shoe laces. The factory closed down in 1991 and the mill has been demolished and the site redeveloped as housing. TQ 563 695 This mill is under the viaduct of the Chatham Main Line railway. In 1700 there were two corn mills and
20234-705: The way from Fiddler's Island in Oxfordshire to the Isle of Sheppey in Kent. Some of the largest inland islands, for example Formosa Island near Cookham and Andersey Island at Abingdon, were created naturally when the course of the river divided into separate streams. In the Oxford area the river splits into several streams across the floodplain ( Seacourt Stream , Castle Mill Stream , Bulstake Stream and others), creating several islands ( Fiddler's Island , Osney and others). Desborough Island , Ham Island at Old Windsor and Penton Hook Island were artificially created by lock cuts and navigation channels. Chiswick Eyot
20385-412: The western part. The area is among the driest in the United Kingdom. Water resources consist of groundwater from aquifers and water taken from the Thames and its tributaries, much of it stored in large bank-side reservoirs . The Thames itself provides two-thirds of London's drinking water, while groundwater supplies about 40 per cent of public water supplies in the overall catchment area. Groundwater
20536-480: The work " Histoire de la mission de pères capucins en l'Isle de Maragnan et terres circonvoisines ", where he exposed that the Tupinambá people already had an understanding of the relation between the Moon and the tides before Europe. William Thomson (Lord Kelvin) led the first systematic harmonic analysis of tidal records starting in 1867. The main result was the building of a tide-predicting machine using
20687-580: The year, while those at Thames Head are seasonal (a winterbourne ). With a length of 215 mi (346 km), the Thames is the longest river entirely in England. (The longest river in the United Kingdom, the Severn , flows partly in Wales .) However, as the River Churn, sourced at Seven Springs, is 14 mi (23 km) longer than the section of the Thames from its traditional source at Thames Head to
20838-410: Was James Marchane, who was joined by his son James. James Jr died in 1805 and James Sr died c. 1812. The mill was sketched by G. Samuel in 1818. It had an overshot waterwheel . The cast iron overshot waterwheel was 12 feet (3.66 m) by 2 feet 9.5 inches (0.85 m). It was fitted in 1868, replacing a wooden wheel which may have been breast shot. In 1890, the waterwheel was adapted to drive
20989-435: Was a corn mill. Originally powered by an internal breast shot waterwheel of some 14 feet (4.27 m) by 6 feet (1.83 m) driving one pair of French Burr millstones and one pair of Peak millstones. The great spur wheel was a cast iron wheel with wooden cogs. The waterwheel had been replaced by a turbine which drove the millstones via a great spur wheel that was only 3 feet 3 inches (990 mm) diameter. The mill
21140-413: Was available. The mill was working until 1911, no auxiliary power being used. The building was house converted in the 1920s and survives today. TQ 544 661 This paper mill was founded in 1648 by Huguenot refugees. The paper mill replaced an earlier corn mill. In 1882, it is recorded as having a waterwheel 18 feet 3 inches (5.56 m) by 8 feet (2.44 m). The mill suffered two fires in
21291-477: Was bankrupt as a common brewer, an occupation he carried on along with the mill. Ill health forced his retirement in 1852, and the mill was bought by his brother Stephen. His son, also Stephen, was running Old Mill from 1850, then being 14 years old. Stephen Cannon (father) died in 1872 and Stephen Cannon (son) sold Westminster Mill and Old Mill in order to concentrate the milling business at a mill in Bexley . Latterly
21442-479: Was built at the site of London Bridge . London Bridge is now used as the basis for published tide tables giving the times of high tide . High tide reaches Putney about 30 minutes later than London Bridge, and Teddington about an hour later. The tidal stretch of the river is known as "the Tideway ". Tide tables are published by the Port of London Authority and are available online. Times of high and low tides are also posted on Twitter. The principal tributaries of
21593-519: Was demolished in October 1969. TQ 499 560 Chipstead Mill was a four-storey building which had been enlarged in the late 19th century. It worked until after the Second World War, but the machinery had been removed by 1950. The waterwheel was overshot and drove two pairs of French Burr millstones. A steam engine provided auxiliary power until it was replaced by a 75 horsepower (56 kW) suction gas engine . Roller milling plant had been installed in
21744-649: Was demolished in September 1928. Photographs of the mill during demolition reveal the cast iron low breast shot waterwheel drove three pairs of millstones via a cast iron layshaft. The original wooden upright shaft and crown wheel were retained. TQ 552 718 A site mentioned in Domesday, the mills here were held by the manor of Bignoures and belonged to the Knights of St. John in the Middle Ages , being let at
21895-463: Was frequently lethal. Some cases continued to occur into the early 20th century. Draining of the marshes helped with its eradication, but the causes are complex and unclear. The East End of London , also known simply as the East End , was the area of London east of the medieval walled City of London and north of the River Thames, although it is not defined by universally accepted formal boundaries;
22046-515: Was house converted in 1971. TQ 520 621 This was the site of a fulling mill belonging to Palsters Manor. It was bought by the Passele family in the 14th century. The manor passed to Francis Sandbach in 1578 and was willed to John Polhill. He bought the fulling mill in 1602. The last mill on the site was a paper mill; it was demolished in 1936. The low breast shot waterwheel was 16 feet (4.88 m) by 8 feet (2.44 m). It drove machinery via
22197-519: Was laid down by river and tide from 1986 when the Creek was effectively abandoned. The tops of some mudbanks are now some two metres high; while others would need only minimal adjustment to accommodate the movement and docking of largish craft with no impact on the nature of the river. Work parties surveyed, cleared and removed hazardous debris from the river bed to permit safe passage of all types of craft during low water. Volunteers and lengthsmen removed
22348-549: Was of cast iron with wooden floats. It was12 feet (3.66 m) by 10 feet (3.05 m). TQ 557 713 This corn mill stood at Old Mill Farm. It was built by Thomas Edmeads in the early 19th century. In 1806 the tenant millers were Stephen and George Cannon. The Cannon brothers were declared bankrupt in May 1816 but discharged their debts and returned to milling. George Cannon was again declared bankrupt in 1823. Stephen Cannon had three sons William, George and Stephen. They all learnt
22499-596: Was still in existence in 1980. TQ 470 552 This was a corn mill, now converted to a dwelling. The cast iron breast shot waterwheel was 13 feet (3.96 m) by 6 feet 6 inches (1.98 m). In September 1812, James Weight, miller of Brasted, was claiming relief for himself, his wife and five children. A man by the name of Staples who went by the name of Chapman had leased the mill in Brasted in 1812; he claimed relief in January 1815. The mill ceased work in
22650-617: Was subject to minor redefining and widening of the main channel around Oxford, Abingdon and Marlow before 1850, when further cuts to ease navigation reduced distances further. Molesey faces Hampton , and in Greater London the Thames passes Hampton Court Palace , Surbiton , Kingston upon Thames , Teddington , Twickenham , Richmond (with a famous view of the Thames from Richmond Hill), Syon House , Kew , Brentford , Chiswick , Barnes , Hammersmith , Fulham , Putney , Wandsworth , Battersea and Chelsea . In central London ,
22801-483: Was that the pitwheel was the same diameter as the waterwheel. The mill had ceased working by 1914. The upper storeys of the mill were demolished in February 1936, leaving the brick base, waterwheel and some machinery. These had been cleared away by June 1965. TQ 563 697 South Darenth Mill was a brick building that replaced an earlier mill that burnt down in 1879. This mill was run by the Cannon family. The mill had
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