Ultra-linear electronic circuits are those used to couple a tetrode or pentode vacuum-tube (also called "electron-valve") to a load (e.g. to a loudspeaker ).
102-417: 'Ultra-linear' is a special case of 'distributed loading'; a circuit technique patented by Alan Blumlein in 1937 (Patent No. 496,883), although the name 'distributed loading' is probably due to Mullard . In 1938 he applied for the US patent 2218902. The particular advantages of ultra-linear operation, and the name itself, were published by David Hafler and Herbert Keroes in the early 1950s through articles in
204-655: A synod sometimes exists. This congregation / presbytery / synod / general assembly schema is based on the historical structure of the larger Presbyterian churches, such as the Church of Scotland or the Presbyterian Church (U.S.A.) ; some bodies, such as the Presbyterian Church in America and the Presbyterian Church in Ireland , skip one of the steps between congregation and General Assembly, and usually
306-475: A bus driver to allow him to drive the vehicle from Penzance to Land's End . On another he spent several hours assisting the operator of a railway signal box in his duties at Paddington Station . Presbyterian Christianity • Protestantism Presbyterianism is a Reformed (Calvinist) Protestant tradition named for its form of church government by representative assemblies of elders . Though other Reformed churches are structurally similar,
408-551: A call for the pastor or minister's service, but this call must be ratified by the local presbytery. The pastor or minister is a teaching elder, and Moderator of the Session, but is not usually a member of the congregation; instead, this person is a member of the Presbytery of which the given church is a member. Ruling elders are elected by the congregation and ordained to serve with the teaching elders, assuming responsibility for
510-680: A chaplaincy by the PCofE and the Church of Scotland in 1908 and as a congregation of the PCofE in 1929), continue as congregations of the URC and university chaplaincies of the Church of Scotland . In recent years a number of smaller denominations adopting Presbyterian forms of church government have organised in England, including the International Presbyterian Church planted by evangelical theologian Francis Schaeffer of
612-423: A form of feedback, which alters the behaviour of the electron stream passing from cathode to anode. By judicious choice of the screen-grid percentage-tap, the benefits of both triode and pentode vacuum-tubes can be realised. Over a very narrow range of percentage-tapping, distortion is found to fall to an unusually low value—sometimes less than for either triode or pentode operation—while power efficiency
714-624: A full-length Old English style surplice which resembles the Celtic alb, an ungirdled liturgical tunic of the old Gallican Rite ), which some, particularly those identifying with the Liturgical Renewal Movement, hold to be more ancient and representative of a more ecumenical past. Presbyterians traditionally have held the Worship position that there are only two sacraments : Some early Presbyterians, which were influenced by
816-618: A major split, the Salter's Hall controversy , occurred; with the majority siding with nontrinitarian views. Thomas Bradbury published several sermons bearing on the controversy, and in 1719, "An answer to the reproaches cast on the dissenting ministers who subscribed their belief of the Eternal Trinity." By the 18th century many English Presbyterian congregations had become Unitarian in doctrine. A number of new Presbyterian Churches were founded by Scottish immigrants to England in
918-474: A revolt against modernist doctrine in his Christianity and Liberalism (1923) that critiqued theological modernism. He argued that modernism and liberal theology was a false religion, a pretender that cloaks itself in Christian language – "Liberalism". This religion is a marriage of naturalism, humanism, secularism, and sentimentalism all rolled into one. Presbyterian denominations that trace their heritage to
1020-551: A small team which developed the concept into a practical cutter. The other principal team members were Herbert Holman and Henry "Ham" Clark. Their work resulted in several patents. Early in 1931, the Columbia Graphophone Company and the Gramophone Company merged and became EMI . New joint research laboratories were set up at Hayes and Blumlein was officially transferred there on 1 November
1122-453: A striking facade clad in limestone and punctuated by large windows, alongside abstract stained-glass windows. Both of these were designed by famed architect Harold E. Wagoner . Usually a Presbyterian church will not have statues of saints, nor the ornate altar more typical of a Catholic church. Instead, there is a "communion table", usually on the same level as the congregation, and sometimes elevated similar to an altar, however surrounded by
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#17327730353881224-626: A sufficient number of parachutes for all individuals involved. After the RAF investigative board completed its report on the Halifax crash, it was ordered to be kept secret by Prime Minister Churchill, and the cause of the crash was not revealed publicly, even to the relatives of the deceased. As a result, numerous unfounded rumours of German sabotage as the cause of the crash would circulate for many years afterwards. Alan Blumlein had two sons, Simon Blumlein and David Blumlein. Outside his work, Blumlein
1326-561: A table in the chancel. By using the "empty" cross, or cross of the Westminster/Celtic cross, Presbyterians emphasize the resurrection and that Christ is not continually dying, but died once and is alive for all eternity. Quite a few Presbyterian church buildings are decorated with a cross, that has a circle around the center, or Celtic cross. This not only emphasizes the resurrection, but also acknowledges historical aspects of Presbyterianism. A baptismal font will be located either at
1428-776: Is also a congregation in the heart of London's financial district called London City Presbyterian Church that is affiliated with the Free Church of Scotland. The Free Presbyterian Church of Scotland also have a congregation in London, as do the Free Presbyterian Church of Ulster - along with five others in England. In 1972, the Presbyterian Church of England (PCofE) united with the Congregational Church in England and Wales to form
1530-662: Is an Italian Protestant denomination. The church was founded in the 12th century, and centuries later, after the Protestant Reformation, it adhered to Calvinist theology and became the Italian branch of the Presbyterian churches. As such, the church is a member of the World Communion of Reformed Churches. Even before Presbyterianism spread with immigrants abroad from Scotland, there were divisions in
1632-463: Is based on a more subtle point: In confessional churches, theology is not solely an individual matter. While individuals are encouraged to understand Scripture, and may challenge the current institutional understanding, theology is carried out by the community as a whole. It is this community understanding of theology that is expressed in confessions. However, there has arisen a spectrum of approaches to confessionalism . The manner of subscription , or
1734-618: Is more of a faint image, with a more modern design. John Knox (1505–1572), a Scot who had spent time studying under Calvin in Geneva, returned to Scotland and urged his countrymen to reform the Church in line with Calvinist doctrines. After a period of religious convulsion and political conflict culminating in a victory for the Protestant party at the Siege of Leith the authority of
1836-577: Is not one fixed "Presbyterian" worship style. Although there are set services for the Lord's Day in keeping with first-day Sabbatarianism , one can find a service to be evangelical and even revivalist in tone (especially in some conservative denominations), or strongly liturgical, approximating the practices of Lutheranism or more of Anglicanism , or semi-formal, allowing for a balance of hymns, preaching, and congregational participation (favored by many American Presbyterians). Most Presbyterian churches follow
1938-480: Is only slightly reduced compared with full pentode operation. The optimum percentage-tap to achieve ultra-linear operation depends mainly on the type of valve used; a commonly seen percentage is 43% (of the number of transformer primary turns on the plate-circuit) which applies to the KT88, although many other valve types have optimum values close to this. A value of 20% was recommended for 6V6GTs. Mullard circuits such as
2040-416: The 5-20 also used 20% distributed loading (but did not achieve ultra-linear operation), while LEAK amplifiers used 50%. The characteristics of the circuit which make distributed loading suitable for audio power amplifiers, when compared to a triode, beam tetrode or pentode based amplifier, are: The distributed load circuit may be applied to either push-pull or single-ended amplifier circuits. Note that
2142-732: The Apostles' Creed ), 16th-century Reformed confessions (the Scots Confession , the Heidelberg Catechism , the Second Helvetic Confession ), and 20th century documents ( The Theological Declaration of Barmen , Confession of 1967 and A Brief Statement of Faith ). The Presbyterian Church in Canada developed the confessional document Living Faith (1984) and retains it as a subordinate standard of
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#17327730353882244-717: The Archbishop of Canterbury , attempted to force the Church of Scotland to use the Book of Common Prayer . What resulted was an armed insurrection, with many Scots signing the Solemn League and Covenant . The Covenanters would serve as the government of Scotland for nearly a decade, and would also send military support to the Parliamentarians during the English Civil War . Following the restoration of
2346-695: The Arminianism of the Wesleyan Methodists. They broke off from the Church of England in 1811, ordaining their own ministers. They were originally known as the Calvinist Methodist connexion and in the 1920s it became alternatively known as the Presbyterian Church of Wales. Presbyterianism ( Irish : Preispitéireachas , Ulster Scots : Prisbytairinism ) is the largest Protestant denomination in Northern Ireland and
2448-563: The Catholic Church was abolished in favour of Reformation by the legislation of the Scottish Reformation Parliament in 1560. The Church was eventually organised by Andrew Melville along Presbyterian lines to become the national Church of Scotland . King James VI and I moved the Church of Scotland towards an episcopal form of government, and in 1637, James' successor, Charles I and William Laud ,
2550-587: The Columbia Graphophone Company , where he reported directly to general manager Isaac Shoenberg . His first project was to find a method of disc cutting that circumvented a Bell patent in the Western Electric moving-iron cutting head then used, and on which substantial royalties had to be paid. He invented the moving-coil disc cutting head, which not only got around the patent but offered greatly improved sound quality. He led
2652-676: The Culdees practiced Christian monasticism , a key feature of Celtic Christianity in the region, with a presbyter exercising "authority within the institution, while the different monastic institutions were independent of one another." The Church in Scotland kept the Christian feast of Easter at a date different from the See of Rome and its monks used a unique style of tonsure . The Synod of Whitby in 664, however, ended these distinctions as it ruled "that Easter would be celebrated according to
2754-588: The Halifax bomber in which he was flying were killed when it crashed at Welsh Bicknor in Herefordshire . Alan Dower Blumlein was born on 29 June 1903 in Hampstead , London. His father, Semmy Blumlein, was a German-born naturalised British subject. Semmy was the son of Joseph Blumlein, a German of Jewish descent, and Philippine Hellmann, a French woman of German descent. Alan's mother, Jessie Dower,
2856-641: The Kingdom of Great Britain . In fact, most Presbyterians in England have a Scottish connection. The Presbyterian denomination was also taken to North America , mostly by Scots and Scots-Irish immigrants. Scotland's Presbyterian denominations hold to the Reformed theology of John Calvin and his immediate successors, although there is a range of theological views within contemporary Presbyterianism. Local congregations of churches that use Presbyterian polity are governed by sessions made up of representatives of
2958-591: The L'Abri Fellowship in the 1970s - now with fifteen English-speaking congregations in England, and 6 Korean-speaking congregations. There is also the Evangelical Presbyterian Church in England and Wales founded in the North of England in the late 1980s. In Wales , Presbyterianism is represented by the Presbyterian Church of Wales , which was originally composed largely of Calvinistic Methodists who accepted Calvinist theology rather than
3060-754: The Larger and Shorter catechisms, which are approved for use in instruction. Many Presbyterian denominations, especially in North America, have adopted all of the Westminster Standards as their standard of doctrine which is subordinate to the Bible. These documents are Calvinistic in their doctrinal orientation. The Presbyterian Church in Canada retains the Westminster Confession of Faith in its original form, while admitting
3162-648: The Parliament of Scotland adopted the Scots Confession as the creed of the Scottish Kingdom. In December 1560, the First Book of Discipline was published, outlining important doctrinal issues but also establishing regulations for church government, including the creation of ten ecclesiastical districts with appointed superintendents which later became known as presbyteries . In time,
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3264-574: The Reformed Presbyterian Church of Ireland and the Evangelical Presbyterian Church . There is a Church of Scotland (Presbyterian) in central Paris: The Scots Kirk , which is English-speaking, and is attended by many nationalities. It maintains close links with the Church of Scotland in Scotland itself, as well as with the Reformed Church of France . The Waldensian Evangelical Church (Chiesa Evangelica Valdese, CEV)
3366-483: The Reformed Presbyterian Church of Scotland , the ' Didasko Presbytery' , the International Presbyterian Church and two congregations of the Free Presbyterian Church of Ulster . Combined, they have over 1500 congregations in Scotland. Within Scotland the term ' kirk ' is usually used to refer to a local Presbyterian church. Informally, the term 'The Kirk' refers to the Church of Scotland. Some of
3468-559: The Reformed Presbyterians , would practice a cappella exclusive psalmody , as well as eschew the celebration of holy days. Among the paleo-orthodox and emerging church movements in Protestant and evangelical churches, in which some Presbyterians are involved, clergy are moving away from the traditional black Geneva gown to such vestments as the alb and chasuble , but also cassock and surplice (typically
3570-695: The United Reformed Church (URC). Among the congregations the PCofE brought to the URC were Tunley (Lancashire), Aston Tirrold (Oxfordshire) and John Knox Presbyterian Church, Stepney, London (now part of Stepney Meeting House URC) – these are among the sole survivors today of the English Presbyterian churches of the 17th century. The URC also has a presence in Scotland, mostly of former Congregationalist Churches. Two former Presbyterian congregations, St Columba's, Cambridge (founded in 1879), and St Columba's, Oxford (founded as
3672-556: The episcopal hierarchy of the Elizabethan Church led to his deprivation of his post by Archbishop John Whitgift and his emigration abroad. Between 1645 and 1648, a series of ordinances of the Long Parliament established Presbyterianism as the polity of the Church of England . Presbyterian government was established in London and Lancashire and in a few other places in England, although Presbyterian hostility to
3774-485: The execution of Charles I and the establishment of the republican Commonwealth of England meant that Parliament never enforced the Presbyterian system in England. The Restoration of the monarchy in 1660 brought the return of Episcopal church government in England (and in Scotland for a short time); but the Presbyterian church in England continued in Non-Conformity, outside of the established church. In 1719
3876-514: The history of Christianity , but the beginning of Presbyterianism as a distinct movement occurred during the 16th century Protestant Reformation . As the Catholic Church resisted the Reformers, several different theological movements splintered from the Church and bore different denominations. Presbyterianism was especially influenced by the French theologian John Calvin , who is credited with
3978-553: The 19th century and later. Following the 'Disruption' in 1843 many of those linked to the Church of Scotland eventually joined what became the Presbyterian Church of England in 1876. Some, such as Crown Court (Covent Garden, London), St Andrew's (Stepney, London) and Swallow Street (London), did not join the English denomination, which is why there are Church of Scotland congregations in England such as those at Crown Court , and St Columba's , Pont Street (Knightsbridge) in London. There
4080-620: The 20th century saw a greater embrace of modern architectural styles, particularly the modernist movement characterized by clean lines, geometric shapes, and open floor plans. Prominent examples include Coral Ridge Presbyterian Church in Fort Lauderdale, Florida, with expansive, light-filled sanctuary and angular design elements. Similarly, the National Presbyterian Church in Washington, D.C., features
4182-622: The 20th century, some Presbyterians played an important role in the ecumenical movement , including the World Council of Churches . Many Presbyterian denominations have found ways of working together with other Reformed denominations and Christians of other traditions, especially in the World Communion of Reformed Churches . Some Presbyterian churches have entered into unions with other churches, such as Congregationalists , Lutherans , Anglicans , and Methodists . Presbyterians in
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4284-484: The Bible, yet directing particularities in the standardisation and translation of the Bible – in Presbyterian churches. Presbyterians place great importance upon education and lifelong learning, tempered with the belief that no human action can affect salvation . Continuous study of the scriptures, theological writings, and understanding and interpretation of church doctrine are embodied in several statements of faith and catechisms formally adopted by various branches of
4386-625: The British Isles usually organise their church services inspired by the principles in the Directory of Public Worship , developed by the Westminster Assembly in the 1640s. This directory documented Reformed worship practices and theology adopted and developed over the preceding century by British Puritans , initially guided by John Calvin and John Knox. It was enacted as law by the Parliament of Scotland , and became one of
4488-837: The Church of Scotland's form of government. However, legislation by the United Kingdom parliament allowing patronage led to splits in the Church. In 1733, a group of ministers seceded from the Church of Scotland to form the Associate Presbytery, another group seceded in 1761 to form the Relief Church and the Disruption of 1843 led to the formation of the Free Church of Scotland . Further splits took place, especially over theological issues, but most Presbyterians in Scotland were reunited by 1929 union of
4590-579: The Presbyterian churches are in Calvinism . Many branches of Presbyterianism are remnants of previous splits from larger groups. Some of the splits have been due to doctrinal controversy, while some have been caused by disagreement concerning the degree to which those ordained to church office should be required to agree with the Westminster Confession of Faith , which historically serves as an important confessional document – second only to
4692-400: The Roman date, not the Celtic date." Although Roman influence came to dominate the Church in Scotland, certain Celtic influences remained in the Scottish Church, such as "the singing of metrical psalms , many of them set to old Celtic Christianity Scottish traditional and folk tunes", which later became a "distinctive part of Scottish Presbyterian worship". Presbyterian history is part of
4794-425: The Scots Confession would be supplanted by the Westminster Confession of Faith , and the larger and shorter catechisms , which were formulated by the Westminster Assembly between 1643 and 1649. Presbyterians distinguish themselves from other denominations by doctrine , institutional organisation (or "church order") and worship , often using a "Book of Order" to regulate common practice and order. The origins of
4896-485: The United States came largely from Scottish , Scots-Irish immigrants , and also from New England communities that were originally Congregational but changed because of an agreed-upon Plan of Union of 1801 for frontier areas. Presbyterian tradition, particularly that of the Church of Scotland , traces its early roots to the Christian Church founded by Saint Columba , through the 6th century Hiberno-Scottish mission . Tracing their apostolic origin to Saint John ,
4998-459: The aircraft owing to several factors, including a loss of altitude while attempting to find an emergency field, the rapidly spreading fire, which blocked or impeded egress from the plane, and the fact that a sufficient number of parachutes were either not on board or were not being worn. Almost immediately following the crash, Prime Minister Winston Churchill issued a directive requiring any test flights with civilians or scientific personnel to carry
5100-417: The cathode has a portion of the output signal applied to it, and was referred to as "distributed load" by Peter Walker of QUAD. In the United States, McIntosh Laboratories used this technique extensively in their vacuum-tube power amplifiers. Audio Research Corp have also used a similar circuit. Alan Blumlein Alan Dower Blumlein ( / ˈ b l ʊ m l aɪ n / ; 29 June 1903 – 7 June 1942)
5202-403: The chancel. There may be a rail between the communion table and the chancel behind it, which may contain a more decorative altar-type table, choir loft, or choir stalls, lectern and clergy area. The altar is called the communion table, and the altar area is called the chancel by Presbyterians. In Presbyterian, and in Reformed churches, there may be an altar cross, either on the communion table or on
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#17327730353885304-567: The church, often referred to as " subordinate standards ". Presbyterian government is by councils (still known as courts in some countries, as boards in others) of elders. Teaching and ruling elders are ordained and convene in the lowest council known as a session or consistory responsible for the discipline, nurture, and mission of the local congregation . Teaching elders (pastors or ministers) have responsibility for teaching, worship, and performing sacraments. Pastors or ministers are called by individual congregations. A congregation issues
5406-438: The cinema. The sound reproduction systems of the early talkies only had a single set of speakers – the actor might be on one side of the screen, but the voice could come from the other. Blumlein declared to his wife that he had found a way to make the sound follow the actor. Blumlein explained his ideas to Isaac Shoenberg in the late summer of 1931. His earliest notes on the subject are dated 25 September 1931, and his patent had
5508-465: The congregation ( elders ), a conciliar approach as with other levels of decision-making ( presbytery , synod , and general assembly ). There are roughly 75 million Presbyterians in the world. Presbyterianism's roots lie in the Reformation of the 16th century. John Calvin's Republic of Geneva was particularly influential. Most Reformed churches that trace their history to Scotland are either presbyterian or congregationalist in government. In
5610-411: The couple were well matched. In 1924 Blumlein started his first job at International Western Electric , a division of the Western Electric Company . The company subsequently became International Standard Electric Corporation and then, later on, Standard Telephones and Cables (STC). During his time there, he measured the amplitude / frequency response of human ears, and used the results to design
5712-404: The crash of an H2S-equipped Handley Page Halifax test aircraft while making a test flight for the Telecommunications Research Establishment (TRE) on 7 June 1942. During the flight from RAF Defford , whilst at an altitude of 500 ft (150 meters) the Halifax developed an engine fire which rapidly grew out of control. The aircraft was seen to lose altitude, then rolled inverted and struck
5814-470: The degree to which the official standards establish the actual doctrine of the church, is a practical matter. That is, the decisions rendered in ordination and in the courts of the church largely determine what the church means, representing the whole, by its adherence to the doctrinal standard. Some Presbyterian traditions adopt only the Westminster Confession of Faith as the doctrinal standard to which teaching elders are required to subscribe, in contrast to
5916-417: The denomination. It is confessional in format, yet like the Westminster Confession, draws attention back to original Bible text. Presbyterians in Ireland who rejected Calvinism and the Westminster Confessions formed the Non-subscribing Presbyterian Church of Ireland . John Gresham Machen, the prominent Presbyterian theologian and Professor of New Testament at Princeton Seminary between 1906 and 1929, led
6018-465: The development of Reformed theology , and the work of John Knox , a Scottish Catholic Priest who studied with Calvin in Geneva and brought back Reformed teachings to Scotland. An important influence on the formation of presbyterianism in Britain also came from John a Lasco , a Polish reformer, the founder of a Stranger's Church in London, based on the Geneva models. The Presbyterian church traces its ancestry back primarily to Scotland. In August 1560,
6120-464: The end of the analogue telephony era. The same duo also invented an improved form of AC measurement bridge which became known as the Blumlein Bridge and subsequently the transformer ratio arm bridge . These two inventions were the basis for Blumlein's first two patents. His inventions while working at STC resulted in another five patents, which were not awarded until after he left the company in 1929. In 1929 Blumlein resigned from STC and joined
6222-473: The entrance or near the chancel area. Presbyterian architecture generally makes significant use of symbolism. One may also find decorative and ornate stained glass windows depicting scenes from the Bible. Some Presbyterian churches will also have ornate statues of Christ or graven scenes from the Last Supper located behind the chancel. St. Giles' Cathedral in Scotland has a crucifix next to an ornate elevated communion table that hangs alongside. The image of Christ
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#17327730353886324-425: The established Church of Scotland and the United Free Church of Scotland . There are now ten Presbyterian denominations in Scotland today. These are, listed by number of congregations within Scotland: the Church of Scotland , the Free Church of Scotland , the United Free Church of Scotland , the Free Presbyterian Church of Scotland , the Free Church of Scotland (Continuing) , the Associated Presbyterian Church ,
6426-507: The first weighting networks. In 1924 he published (with Professor Edward Mallett) the first of his only two IEE papers, on high-frequency resistance measurement. This won him the IEE's Premium award for innovation. The following year he wrote (with Norman Kipping ) a series of seven articles for Wireless World . In 1925 and 1926, Blumlein and John Percy Johns designed an improved form of loading coil which reduced loss and crosstalk in long-distance telephone lines. These were used until
6528-415: The first Presbytery in Philadelphia was established. In time, the presbytery would be joined by two more to form a synod (1717) and would evolve into the Presbyterian Church in the United States of America in 1789. The nation's largest Presbyterian denomination, the Presbyterian Church (U.S.A.) – PC (USA) – can trace its heritage back to the original PCUSA, as can the Presbyterian Church in America (PCA),
6630-477: The foundational documents of Presbyterian church legislation elsewhere. Historically, the driving principle in the development of the standards of Presbyterian worship is the Regulative principle of worship , which specifies that (in worship), what is not commanded is forbidden. Over subsequent centuries, many Presbyterian churches modified these prescriptions by introducing hymnody, instrumental accompaniment, and ceremonial vestments into worship. However, there
6732-443: The full congregation. Since the 20th century, most denominations allow women to be teaching or ruling elders. Above the sessions exist presbyteries, which have area responsibilities. These are composed of teaching elders and ruling elders from each of the constituent congregations. The presbytery sends representatives to a broader regional or national assembly, generally known as the General Assembly , although an intermediate level of
6834-412: The ground. The crash occurred near the village of Welsh Bicknor in Herefordshire. Two of Blumlein's colleagues, Cecil Oswald Browne and Frank Blythen, also died in the crash. The Halifax was carrying a highly-secret cavity magnetron as part of the H2S test system, and the immediate recovery of the device was essential. A team led by Bernard Lovell arrived at the crash scene the same night, and took
6936-412: The historical period in which it was written should be understood when it is read. The Westminster Confession is "The principal subordinate standard of the Church of Scotland " but "with due regard to liberty of opinion in points which do not enter into the substance of the Faith" (V). This formulation represents many years of struggle over the extent to which the confession reflects the Word of God and
7038-423: The larger Presbyterian family. Some later rejoined only to separate again. In what some interpret as rueful self-reproach, some Presbyterians refer to the divided Presbyterian churches as the "Split Ps". Presbyterianism first officially arrived in Colonial America in 1644 with the establishment of Christ's First Presbyterian Church in Hempstead, New York. The Church was organized by the Rev. Richard Denton. In 1703
7140-413: The loosened nut caused increasingly excessive valve clearance eventually allowing collision of the valve head with the rising piston fracturing the valve stem , which then allowed the inlet valve to drop open, resulting in the ignition by the spark plug of the pressurised fuel/air mixture within the inlet manifold and, eventually, the pumping of the ignited fuel outboard of the rocker cover and along
7242-413: The magazine "Audio Engineering" from the USA. The special case of 'ultra linear' operation is sometimes confused with the more general principle of distributed loading. A pentode or tetrode vacuum-tube (valve) configured as a common-cathode amplifier (where the output signal appears on the plate) may be operated as: The impression of any portion of the output signal onto the screen-grid can be seen as
7344-476: The magnetron. "Then reports of a crash in south Wales began to come in and the rest of that night was just a nightmare. I was driven by the C-in-C of the aerodrome [Defford], a man called King, and winding through these lanes near Ross-on-Wye searching for this wreckage, and then the field with the burnt-out Halifax, and of course it was wartime, there was no time for emotions, our first duties were to search for
7446-751: The mainline Presbyterians. These were more of the wave of Presbyterians that were influenced by the Puritans. In the late 19th century a gradual shift began to occur. Prosperous congregations built imposing churches, such as Fourth Presbyterian Church of Chicago , Brick Presbyterian Church in New York City, Shadyside Presbyterian Church in Pennsylvania, St Stephen Presbyterian in Fort Worth, Texas, and many others. While Presbyterian churches historically reflected prevailing architectural trends,
7548-627: The monarchy in 1660, Charles II , despite the initial support that he received from the Covenanters, reinstated an episcopal form of government on the church. However, with the Glorious Revolution of 1688 the Church of Scotland was unequivocally recognised as a Presbyterian institution by the monarch due to Scottish Presbyterian support for the aforementioned revolution and the Acts of Union 1707 between Scotland and England guaranteed
7650-462: The nurture and leadership of the congregation. Often, especially in larger congregations, the elders delegate the practicalities of buildings, finance, and temporal ministry to the needy in the congregation to a distinct group of officers (sometimes called deacons, which are ordained in some denominations). This group may variously be known as a "Deacon Board", "Board of Deacons" "Diaconate", or "Deacons' Court". These are sometimes known as "presbyters" to
7752-415: The outboard section of the starboard wing to separate from the centre section at approximately 350 feet (100 meters) of altitude. With the loss of a substantial part of the starboard wing, all control over level flight was lost, and the plane rolled inverted and struck the ground at approximately 150 mph (240 kph). The board found that the crew and passengers had not jumped immediately from
7854-403: The output transformer to provide feedback to the second grid, which improved the amplifier's linearity. With the tap placed at the anode end of the primary winding, the tube (valve) is effectively connected as a triode , and if the tap was at the supply end, as a pure pentode . Blumlein discovered that if the tap was placed at a distance 15–20% down from the supply end of the output transformer,
7956-438: The outside of the engine, leading to an extensive fire in the engine nacelle . Due to the fire originating in the induction system, where the supercharged fuel/air mixture was at higher pressure than atmospheric, the heart of the fire was much hotter burning and intense than would be the case in a simple fuel fire. Constantly fuelled by the broken intake , the fire burned rapidly along the wing and fuselage, eventually causing
8058-406: The post-war Star Tiger and Star Ariel disappearances – and assisted by Rolls-Royce , who had made the Halifax's Merlin engines, found that the crash was caused by engine fire, attributed to the unscrewing of a tappet nut on the starboard outer engine, which had been improperly tightened by an RAF engine fitter while inspecting the engine three hours prior to the crash. During the flight
8160-503: The precious highly-secret equipment, and collect the bits-and-pieces of it." – Bernard Lovell. After the RAF investigative board completed its report on the Halifax crash on 1 July 1942, it was distributed to a restricted list of approved recipients, but not publicly divulged. In the interests of wartime secrecy, the announcement of Blumlein's death was not made for another three years. The investigative board, headed by AIB Chief Inspector Vernon Brown – who later also investigated
8262-461: The project was a closely guarded secret at the time and consequently only a brief announcement of his death was made some two years later, to avoid providing solace to Hitler. His invention of the line type pulse modulator (ref vol 5 of MIT Radiation Laboratory series) was a major contribution to high-powered pulse radars, not just the H2S's system, and continues to be used today. Blumlein was killed in
8364-413: The puritan movement, were careful to distinguish between the "church", which referred to the members , and the "meeting house", which was the building in which the church met. (Quakers still insist upon this distinction.) Until the late 19th century, very few Presbyterians ever referred to their buildings as "churches". Presbyterians believed that meeting-houses (now called churches) are buildings to support
8466-562: The same year. During the early 1930s Blumlein and Herbert Holman developed a series of moving-coil microphones, which were used in EMI recording studios and by the BBC at Alexandra Palace . In June 1937, Blumlein patented what is now known as the Ultra-Linear amplifier (US Patent 2,218,902, dated 5 June 1937). A deceptively simple design, the circuit provided a tap on the primary winding of
8568-505: The same year. Much of the development work on this system for cinematic use was completed by 1935. In Blumlein's short test films (most notably, "Trains at Hayes Station", which lasts 5 minutes 11 seconds, and, "The Walking & Talking Film"), his original intent of having the sound follow the actor was fully realized. In 1934, Blumlein recorded Mozart 's Jupiter Symphony conducted by Sir Thomas Beecham at Abbey Road Studios in London using his vertical-lateral technique. Television
8670-591: The second largest on the island of Ireland (after the Anglican Church of Ireland ), and was brought by Scottish plantation settlers to Ulster who had been strongly encouraged to emigrate by James VI of Scotland, also James I of Ireland and England . An estimated 100,000 Scottish Presbyterians moved to the northern counties of Ireland between 1607 and the Battle of the Boyne in 1690. The Presbytery of Ulster
8772-503: The step skipped is the Synod. The Church of Scotland abolished the Synod in 1993. Presbyterian governance is practiced by Presbyterian denominations and also by many other Reformed churches . Presbyterianism is historically a confessional tradition. This has two implications. The obvious one is that confessional churches express their faith in the form of "confessions of faith", which have some level of authoritative status. However this
8874-656: The struggle of conscience of those who came to believe it did not fully do so (e.g. William Robertson Smith ). Some Presbyterian churches, such as the Free Church of Scotland , have no such " conscience clause". The Presbyterian Church (U.S.A.) has adopted the Book of Confessions , which reflects the inclusion of other Reformed confessions in addition to the Westminster Standards. These other documents include ancient creedal statements (the Nicene Creed ,
8976-413: The term 'ultra linear' was expressly reserved only for the condition of optimum tapping point. As Hafler and Keroes wrote: " Our patent claims cover the use of any primary tap in this circuit arrangement. However, we have restricted the use of the term "Ultra Linear" to the conditions where the dynamic plate characteristic curves are most linear ". The "QUAD II" amplifier from QUAD uses a circuit in which
9078-417: The title " Improvements in and relating to Sound-transmission, Sound-recording and Sound-reproducing Systems ". The application was dated 14 December 1931, and was accepted on 14 June 1933 as UK patent number 394,325. The patent covered numerous ideas in stereo, some of which are used today. Some 70 claims include: Blumlein's binaural experiments began in early 1933, and the first stereo discs were cut later
9180-420: The traditional liturgical year and observe the traditional holidays, holy seasons, such as Advent , Christmas, Ash Wednesday , Holy Week , Easter, Pentecost , etc. They also make use of the appropriate seasonal liturgical colors , etc. Many incorporate ancient liturgical prayers and responses into the communion services and follow a daily, seasonal, and festival lectionary. Other Presbyterians, however, such as
9282-666: The tube or valve would combine the positive features of both the triode and the pentode design. Blumlein may or may not have invented the long-tailed pair , but his name is on the first patent (1936). The long-tailed pair is a form of differential amplifier that has been popular since the days of the vacuum tube (valve). It is now more pervasive than ever, as it is particularly suitable for implementation in integrated circuit form, and almost every operational amplifier integrated circuit contains at least one. In 1931, Blumlein invented what he called "binaural sound", now known as stereophonic sound . In early 1931, he and his wife were at
9384-402: The two were married in 1933. Lane was warned by acquaintances before the wedding that, "There was a joke amongst some of his friends, they used to call it 'Blumlein-itis' or 'First Class Mind'. It seems that he didn't want to know anyone who didn't have a first class mind." Recording engineer Joseph B. Kaye, known as J. B. Kaye, who was Blumlein's closest friend and best man at the wedding, thought
9486-577: The values and ideals espoused in Scottish Presbyterian denominations can be reflected in this reference in a book from Norman Drummond, chaplain to the Queen in Scotland. Chart of splits and mergers of the Scottish Presbyterian churches In England, Presbyterianism was established in secret in 1592. Thomas Cartwright is thought to be the first Presbyterian in England. Cartwright's controversial lectures at Cambridge University condemning
9588-541: The word Presbyterian is applied to churches that trace their roots to the Church of Scotland or to English Dissenter groups that formed during the English Civil War . Presbyterian theology typically emphasizes the sovereignty of God , the authority of the Scriptures , and the necessity of grace through faith in Christ. Scotland ensured Presbyterian church government in the 1707 Acts of Union , which created
9690-589: The world's first scheduled "high definition" (240 lines or better) television service – which was later adopted as the CCIR System A . Blumlein was so central to the development of the H2S airborne radar system (to aid bomb targeting), that after his death in June 1942, many believed that the project would fail. However it survived and was a factor in shortening the Second World War . Blumlein's role in
9792-406: The worship of God. The decor in some instances was austere so as not to detract from worship. Early Presbyterian meeting-houses were extremely plain. No stained glass, no elaborate furnishings, and no images were to be found in the meeting-house. The pulpit, often raised so as only to be accessible by a staircase, was the centerpiece of the building. But these were not the standard characteristics of
9894-591: Was Scottish , daughter of William Dower (born 1837) who went to South Africa for the London Missionary Society . Alan was christened as a Presbyterian ; he later married in a Church of England parish church. Alan Blumlein's future career seemed to have been determined by the age of seven, when he presented his father with an invoice for repairing the doorbell, signed "Alan Blumlein, Electrical Engineer" (with "paid" scrawled in pencil). His sister claimed that he could not read proficiently until he
9996-452: Was 12. He replied "no, but I knew a lot of quadratic equations!" After leaving Highgate School in 1921, he studied at City and Guilds College (part of Imperial College ). He won a Governors' scholarship and joined the second year of the course. He graduated with a First-Class Honours BSc two years later. In mid-1930, Blumlein met Doreen Lane, a preparatory school teacher five years his junior. After two-and-a-half years of courtship
10098-499: Was a lover of music and he attempted to learn to play the piano, but gave it up. He enjoyed horse riding and occasionally went cub hunting with his father-in-law. He was interested in many forms of engineering, including aviation, motor engineering and railway engineering. He obtained a pilot's licence and flew Tiger Moth aircraft of the London Aerodrome Club at Stag Lane Aerodrome . On one occasion, he persuaded
10200-425: Was an English electronics engineer, notable for his many inventions in telecommunications, sound recording , stereophonic sound , television and radar. He received 128 patents and was considered one of the most significant engineers and inventors of his time. He died during World War II , on 7 June 1942, aged 38, during the secret trial of an H2S airborne radar system then under development, when all on board
10302-501: Was developed by many individuals and companies throughout the 1920s and 1930s. Blumlein's contributions, as a member of the EMI team, started in earnest in 1933 when his boss, Isaac Shoenberg, assigned him full-time to TV research. His ideas included: Blumlein was also largely responsible for the development of the waveform structure used in the 405-line Marconi-EMI system – developed for the UK's BBC Television Service at Alexandra Palace ,
10404-561: Was formed in 1642 separately from the established Anglican Church. Presbyterians, along with Catholics in Ulster and the rest of Ireland, suffered under the discriminatory Penal Laws until they were revoked in the early 19th century. Presbyterianism is represented in Ireland by the Presbyterian Church in Ireland , the Non-subscribing Presbyterian Church of Ireland , the Free Presbyterian Church of Ulster ,
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