A lighthouse is a tower, building, or other type of physical structure designed to emit light from a system of lamps and lenses and to serve as a beacon for navigational aid for maritime pilots at sea or on inland waterways.
131-589: Boston Light is a lighthouse located on Little Brewster Island in outer Boston Harbor, Massachusetts . The first lighthouse to be built on the site dates back to 1716, and was the first lighthouse to be built in what is now the United States . The current lighthouse dates from 1783. It is the second oldest working lighthouse in the United States (after Sandy Hook Lighthouse in New Jersey ) and
262-402: A rescue service , if necessary. Improvements in maritime navigation and safety, such Global Positioning System (GPS), led to the phasing out of non-automated lighthouses across the world. Although several closed due to safety concerns, Canada still maintains 49 staffed lighthouses, split roughly evenly across east and west coasts. The remaining modern lighthouses are usually illuminated by
393-442: A towing tank for testing ship and ocean structure designs, and previously Alcator C-Mod , which was the largest fusion device operated by any university. MIT's campus-wide wireless network was completed in the fall of 2005 and consists of nearly 3,000 access points covering 9.4 × 10 ^ sq ft (870,000 m ) of campus. The campus' primary energy source is natural gas. In connection with capital campaigns to expand
524-401: A "technological" research university and to build more autonomy from private industry. In the 1930s, President Karl Taylor Compton and Vice-President (effectively Provost ) Vannevar Bush emphasized the importance of pure sciences like physics and chemistry and reduced the vocational practice required in shops and drafting studios. The Compton reforms "renewed confidence in the ability of
655-640: A Diesel generator for backup. Many Fresnel lens installations have been replaced by rotating aerobeacons , which require less maintenance. In modern automated lighthouses, the system of rotating lenses is often replaced by a high intensity light that emits brief omnidirectional flashes, concentrating the light in time rather than direction. These lights are similar to obstruction lights used to warn aircraft of tall structures. Later innovations were "Vega Lights", and experiments with light-emitting diode (LED) panels. LED lights, which use less energy and are easier to maintain, had come into widespread use by 2020. In
786-600: A dense high-rise transit-oriented development plan. The MIT Museum has moved immediately adjacent to a Kendall Square subway entrance, joining the List Visual Arts Center on the eastern end of the campus. Each building at MIT has a number (possibly preceded by a W , N , E , or NW ) designation, and most have a name as well. Typically, academic and office buildings are referred to primarily by number while residence halls are referred to by name. The organization of building numbers roughly corresponds to
917-564: A desperate search for a new campus and funding. Eventually, the MIT Corporation approved a formal agreement to merge with Harvard and move to Allston, over the vehement objections of MIT faculty, students, and alumni. The merger plan collapsed in 1905 when the Massachusetts Supreme Judicial Court rules that MIT could not sell its Back Bay land. In 1912, MIT acquired its current campus by purchasing
1048-436: A filament source. Experimental installations of laser lights, either at high power to provide a "line of light" in the sky or, utilising low power, aimed towards mariners have identified problems of increased complexity in installation and maintenance, and high power requirements. The first practical installation, in 1971 at Point Danger lighthouse , Queensland , was replaced by a conventional light after four years, because
1179-676: A first for a non-industrial – much less university – building in the US. Bosworth's design was influenced by the City Beautiful Movement of the early 1900s and features the Pantheon -esque Great Dome housing the Barker Engineering Library. The Great Dome overlooks Killian Court, where graduation ceremonies are held each year. The friezes of the limestone-clad buildings around Killian Court are engraved with
1310-457: A form of concrete that will set under water used by the Romans, and developed a technique of securing the granite blocks together using dovetail joints and marble dowels . The dovetailing feature served to improve the structural stability , although Smeaton also had to taper the thickness of the tower towards the top, for which he curved the tower inwards on a gentle gradient. This profile had
1441-414: A horizontal plane, and horizontally the light is focused into one or a few directions at a time, with the light beam swept around. As a result, in addition to seeing the side of the light beam, the light is directly visible from greater distances, and with an identifying light characteristic . This concentration of light is accomplished with a rotating lens assembly. In early lighthouses, the light source
SECTION 10
#17327807091751572-538: A marine guard when General Washington dispatched Major Benjamin Tupper with 300 men in whaleboats on July 31, 1775, who defeated the guard and destroyed the repair work done. They were intercepted on leaving by British small boats and attacked. A direct hit on one of the British boats by an American field piece on Nantasket Head caused the British to retire to their boats with comparatively heavy losses. Only one American
1703-534: A mile along the north side of the Charles River basin. The campus is divided roughly in half by Massachusetts Avenue , with most dormitories and student life facilities to the west and most academic buildings to the east. The bridge closest to MIT is the Harvard Bridge , which is known for being marked off in a non-standard unit of length – the smoot . The Kendall/MIT MBTA Red Line station
1834-488: A modest fee. The " edX " online platform supporting MITx was initially developed in partnership with Harvard and its analogous "Harvardx" initiative. The courseware platform is open source, and other universities have already joined and added their own course content. In March 2009 the MIT faculty adopted an open-access policy to make its scholarship publicly accessible online. MIT has its own police force. Three days after
1965-427: A more powerful hyperradiant Fresnel lens manufactured by the firm of Chance Brothers . While lighthouse buildings differ depending on the location and purpose, they tend to have common components. A light station comprises the lighthouse tower and all outbuildings, such as the keeper's living quarters, fuel house, boathouse, and fog-signaling building. The Lighthouse itself consists of a tower structure supporting
2096-602: A navigator with a line of position called a range in North America and a transit in Britain. Ranges can be used to precisely align a vessel within a narrow channel such as a river. With landmarks of a range illuminated with a set of fixed lighthouses, nighttime navigation is possible. Such paired lighthouses are called range lights in North America and leading lights in the United Kingdom. The closer light
2227-496: A new Schwarzman College of Computing dedicated to the study of artificial intelligence, named after lead donor and The Blackstone Group CEO Stephen Schwarzman . The focus of the new college is to study not just AI, but interdisciplinary AI education, and how AI can be used in fields as diverse as history and biology. The cost of buildings and new faculty for the new college is expected to be $ 1 billion upon completion. The Laser Interferometer Gravitational-Wave Observatory (LIGO)
2358-521: A number of screw-pile lighthouses. Englishman James Douglass was knighted for his work on the fourth Eddystone Lighthouse. United States Army Corps of Engineers Lieutenant George Meade built numerous lighthouses along the Atlantic and Gulf coasts before gaining wider fame as the winning general at the Battle of Gettysburg . Colonel Orlando M. Poe , engineer to General William Tecumseh Sherman in
2489-678: A one-mile (1.6 km) tract of filled lands along the Cambridge side of the Charles River. The neoclassical "New Technology" campus was designed by William W. Bosworth and had been funded largely by anonymous donations from a mysterious "Mr. Smith", starting in 1912. In January 1920, the donor was revealed to be the industrialist George Eastman , an inventor of film production methods and founder of Eastman Kodak . Between 1912 and 1920, Eastman donated $ 20 million ($ 304.2 million in 2024 dollars) in cash and Kodak stock to MIT. In 1916, with
2620-402: A particular color (usually formed by colored panes in the lantern) to distinguish safe water areas from dangerous shoals. Modern lighthouses often have unique reflectors or racon transponders so the radar signature of the light is also unique. Before modern strobe lights , lenses were used to concentrate the light from a continuous source. Vertical light rays of the lamp are redirected into
2751-405: A polytechnic school is, as I conceive, the teaching, not of the minute details and manipulations of the arts, which can be done only in the workshop, but the inculcation of those scientific principles which form the basis and explanation of them, and along with this, a full and methodical review of all their leading processes and operations in connection with physical laws. The Rogers Plan reflected
SECTION 20
#17327807091752882-411: A reservoir mounted above the burner. The lamp was first produced by Matthew Boulton , in partnership with Argand, in 1784, and became the standard for lighthouses for over a century. South Foreland Lighthouse was the first tower to successfully use an electric light in 1875. The lighthouse's carbon arc lamps were powered by a steam-driven magneto . John Richardson Wigham was the first to develop
3013-415: A single stationary flashing light powered by solar-charged batteries and mounted on a steel skeleton tower. Where the power requirement is too great for solar power alone, cycle charging of the battery by a Diesel generator is provided. The generator only comes into use when the battery needs charging, saving fuel and increasing periods between maintenance. John Smeaton is noteworthy for having designed
3144-421: A special type of educational institution which can be defined as a university polarized around science, engineering, and the arts. We might call it a university limited in its objectives but unlimited in the breadth and the thoroughness with which it pursues these objectives. —MIT president James Rhyne Killian These activities affected MIT profoundly. A 1949 report noted the lack of "any great slackening in
3275-477: A system for gas illumination of lighthouses. His improved gas 'crocus' burner at the Baily Lighthouse near Dublin was 13 times more powerful than the most brilliant light then known. The vaporized oil burner was invented in 1901 by Arthur Kitson , and improved by David Hood at Trinity House . The fuel was vaporized at high pressure and burned to heat the mantle, giving an output of over six times
3406-480: Is a private research university in Cambridge, Massachusetts , United States. Established in 1861, MIT has played a significant role in the development of many areas of modern technology and science . Founded in response to the increasing industrialization of the United States , MIT adopted a European polytechnic university model and stressed laboratory instruction in applied science and engineering . MIT
3537-497: Is a large, highly residential, research university with a majority of enrollments in graduate and professional programs. The university has been accredited by the New England Association of Schools and Colleges since 1929. MIT operates on a 4–1–4 academic calendar with the fall semester beginning after Labor Day and ending in mid-December, a 4-week "Independent Activities Period" in the month of January, and
3668-593: Is located on the northeastern edge of the campus, in Kendall Square . The Cambridge neighborhoods surrounding MIT are a mixture of high tech companies occupying both modern office and rehabilitated industrial buildings, as well as socio-economically diverse residential neighborhoods. In early 2016, MIT presented its updated Kendall Square Initiative to the City of Cambridge, with plans for mixed-use educational, retail, residential, startup incubator, and office space in
3799-419: Is one example. Race Rocks Light in western Canada is painted in horizontal black and white bands to stand out against the horizon. For effectiveness, the lamp must be high enough to be seen before the danger is reached by a mariner. The minimum height is calculated by trigonometry (see Distance to the horizon ) as D = 1.22 H {\displaystyle D=1.22{\sqrt {H}}} , where H
3930-617: Is one of three private land-grant universities in the United States, the others being Cornell University and Tuskegee University . The institute has an urban campus that extends more than a mile (1.6 km) alongside the Charles River , and operates off-campus facilities including the MIT Lincoln Laboratory , the Bates Center, and the Haystack Observatory , as well as affiliated laboratories such as
4061-555: Is referred to as the beacon or front range; the further light is called the rear range. The rear range light is almost always taller than the front. When a vessel is on the correct course, the two lights align vertically, but when the observer is out of position, the difference in alignment indicates the direction of travel to correct the course. There are two types of lighthouses: ones that are located on land, and ones that are offshore. Massachusetts Institute of Technology The Massachusetts Institute of Technology ( MIT )
Boston Light - Misplaced Pages Continue
4192-510: Is the height above water in feet, and D is the distance from the lighthouse to the horizon in nautical miles, the lighthouse range . Where dangerous shoals are located far off a flat sandy beach, the prototypical tall masonry coastal lighthouse is constructed to assist the navigator making a landfall after an ocean crossing. Often these are cylindrical to reduce the effect of wind on a tall structure, such as Cape May Light . Smaller versions of this design are often used as harbor lights to mark
4323-459: Is the largest research facility of its kind in the nation. With a cost of US$ 400 million, it is also one of the costliest buildings on campus. The facility also provides state-of-the-art nanoimaging capabilities with vibration damped imaging and metrology suites sitting atop a 5 × 10 ^ lb (2,300,000 kg) slab of concrete underground. Other notable campus facilities include a pressurized wind tunnel for testing aerodynamic research,
4454-470: Is the largest taxpayer in the city, contributing approximately 14% of the city's annual revenues. Holdings include Technology Square , parts of Kendall Square , University Park , and many properties in Cambridgeport and Area 4 neighboring the main campus. The land is held for investment purposes and potential long-term expansion. MIT's School of Architecture , founded in 1865 and now called
4585-571: Is the only lighthouse to still be actively staffed by the United States Coast Guard despite its automation in 1998. The structure was designated a National Historic Landmark in 1964. The first keeper of Boston Light was George Worthylake , who drowned, along with his wife and daughter, when returning to the island in 1718. During the American Revolution , the original lighthouse was held by British forces and
4716-403: Is widely conceived as basically a vocational school", a "partly unjustified" perception the committee sought to change. The report comprehensively reviewed the undergraduate curriculum, recommended offering a broader education, and warned against letting engineering and government-sponsored research detract from the sciences and humanities. The School of Humanities, Arts, and Social Sciences and
4847-580: The Artificial Intelligence Laboratory , and the Tech Model Railroad Club wrote some of the earliest interactive computer video games like Spacewar! and created much of modern hacker slang and culture. Several major computer-related organizations have originated at MIT since the 1980s: Richard Stallman 's GNU Project and the subsequent Free Software Foundation were founded in the mid-1980s at
4978-547: The Boston Marathon bombing of April 2013, MIT Police patrol officer Sean Collier was fatally shot by the suspects Dzhokhar and Tamerlan Tsarnaev , setting off a violent manhunt that shut down the campus and much of the Boston metropolitan area for a day. One week later, Collier's memorial service was attended by more than 10,000 people, in a ceremony hosted by the MIT community with thousands of police officers from
5109-479: The Broad and Whitehead Institutes . As of October 2024 , 105 Nobel laureates , 26 Turing Award winners, and 8 Fields Medalists have been affiliated with MIT as alumni, faculty members, or researchers. In addition, 58 National Medal of Science recipients, 29 National Medals of Technology and Innovation recipients, 50 MacArthur Fellows , 83 Marshall Scholars , 41 astronauts , 16 Chief Scientists of
5240-622: The Florida Reef along the Florida Keys, beginning with the Carysfort Reef Light in 1852. In waters too deep for a conventional structure, a lightship might be used instead of a lighthouse, such as the former lightship Columbia . Most of these have now been replaced by fixed light platforms (such as Ambrose Light ) similar to those used for offshore oil exploration . Aligning two fixed points on land provides
5371-587: The German research university model , emphasizing an independent faculty engaged in research, as well as instruction oriented around seminars and laboratories. Two days after MIT was chartered, the first battle of the Civil War broke out. After a long delay through the war years, MIT's first classes were held in the Mercantile Building in Boston in 1865. The new institute was founded as part of
Boston Light - Misplaced Pages Continue
5502-508: The MIT Sloan School of Management were formed in 1950 to compete with the powerful Schools of Science and Engineering . Previously marginalized faculties in the areas of economics, management, political science, and linguistics emerged into cohesive and assertive departments by attracting respected professors and launching competitive graduate programs. The School of Humanities, Arts, and Social Sciences continued to develop under
5633-700: The Morrill Land-Grant Colleges Act to fund institutions "to promote the liberal and practical education of the industrial classes" and was a land-grant school. In 1863 under the same act, the Commonwealth of Massachusetts founded the Massachusetts Agricultural College , which developed as the University of Massachusetts Amherst . In 1866, the proceeds from land sales went toward new buildings in
5764-554: The One Laptop per Child initiative to expand computer education and connectivity to children worldwide was launched in 2005. MIT was named a sea-grant college in 1976 to support its programs in oceanography and marine sciences and was named a space-grant college in 1989 to support its aeronautics and astronautics programs. Despite diminishing government financial support over the past quarter century, MIT launched several successful development campaigns to significantly expand
5895-546: The governor of Massachusetts , on April 10, 1861. Rogers, who was educated at the College of William & Mary and later held professorships at both William & Mary and the University of Virginia , wanted to establish an institution to address rapid scientific and technological advances. He did not wish to found a professional school , but a combination with elements of both professional and liberal education , proposing that: The true and only practicable object of
6026-467: The "Technology Plan" in 1920. As MIT grew under the Tech Plan, it built new postgraduate programs that stressed laboratory work on industry problems, including a new program in electrical engineering. Gerard Swope , MIT's chairman and head of General Electric , believed talented engineers needed scientific research training. In 1930, he recruited Karl Taylor Compton to helm MIT's transformation as
6157-510: The 1980s, there was more controversy at MIT over its involvement in SDI (space weaponry) and CBW (chemical and biological warfare) research. More recently, MIT's research for the military has included work on robots, drones and 'battle suits'. MIT has kept pace with and helped to advance the digital age. In addition to developing the predecessors to modern computing and networking technologies, students, staff, and faculty members at Project MAC ,
6288-513: The 20th century. These often have a narrow cylindrical core surrounded by an open lattice work bracing, such as Finns Point Range Light . Sometimes a lighthouse needs to be constructed in the water itself. Wave-washed lighthouses are masonry structures constructed to withstand water impact, such as Eddystone Lighthouse in Britain and the St. George Reef Light of California. In shallower bays, Screw-pile lighthouse ironwork structures are screwed into
6419-742: The AI Lab; the MIT Media Lab was founded in 1985 by Nicholas Negroponte and Jerome Wiesner to promote research into novel uses of computer technology; the World Wide Web Consortium standards organization was founded at the Laboratory for Computer Science in 1994 by Tim Berners-Lee ; the OpenCourseWare project has made course materials for over 2,000 MIT classes available online free of charge since 2002; and
6550-556: The Back Bay. MIT was informally called "Boston Tech". The institute adopted the European polytechnic university model and emphasized laboratory instruction from an early date. Despite chronic financial problems, the institute saw growth in the last two decades of the 19th century under President Francis Amasa Walker . Programs in electrical, chemical, marine, and sanitary engineering were introduced, new buildings were built, and
6681-568: The Boston area's classical architecture and serve as examples of contemporary campus " starchitecture ". These buildings have not always been well received; in 2010, The Princeton Review included MIT in a list of twenty schools whose campuses are "tiny, unsightly, or both". Undergraduates are guaranteed four-year housing in one of MIT's 11 undergraduate dormitories. Those living on campus can receive support and mentoring from live-in graduate student tutors, resident advisors, and faculty housemasters. Because housing assignments are made based on
SECTION 50
#17327807091756812-611: The Institute to develop leadership in science as well as in engineering". Unlike Ivy League schools, MIT catered more to middle-class families, and depended more on tuition than on endowments or grants for its funding. The school was elected to the Association of American Universities in 1934. Still, as late as 1949, the Lewis Committee lamented in its report on the state of education at MIT that "the Institute
6943-514: The LIGO detector and the observation of gravitational waves, two Caltech physicists, Kip Thorne and Barry Barish , and MIT physicist Rainer Weiss won the Nobel Prize in physics in 2017. Weiss, who is also an MIT graduate, designed the laser interferometric technique, which served as the essential blueprint for the LIGO. In April of 2024, MIT students joined other campuses across
7074-528: The MIT Investment Management Company (MITIMCo), a subsidiary of the MIT Corporation created in 2004. A minor revenue source for much of the Institute's history, the endowment's role in MIT operations has grown due to strong investment returns since the 1990s, making it one the largest endowments held by American universities . Among its holdings are a majority of shares in the audio equipment manufacturer Bose Corporation . MIT
7205-628: The Massachusetts Institute of Technology, Acts of 1861, Chapter 183 In 1859, a proposal was submitted to the Massachusetts General Court to use newly filled lands in Back Bay , Boston for a " Conservatory of Art and Science ", but the proposal failed. A charter for the incorporation of the Massachusetts Institute of Technology, proposed by William Barton Rogers , was signed by John Albion Andrew ,
7336-638: The Media Lab, the Sloan School's eastern campus, and graduate residences in the northwest. In 2006, President Hockfield launched the MIT Energy Research Council to investigate the interdisciplinary challenges posed by increasing global energy consumption . In 2001, inspired by the open source and open access movements , MIT launched OpenCourseWare to make the lecture notes, problem sets , syllabi, exams, and lectures from
7467-535: The New England region and Canada. On November 25, 2013, MIT announced the creation of the Collier Medal, to be awarded annually to "an individual or group that embodies the character and qualities that Officer Collier exhibited as a member of the MIT community and in all aspects of his life". The announcement further stated that "Future recipients of the award will include those whose contributions exceed
7598-523: The School of Architecture and Planning, was the first formal architecture program in the United States, and it has a history of commissioning progressive buildings. The first buildings constructed on the Cambridge campus, completed in 1916, are sometimes called the "Maclaurin buildings" after Institute president Richard Maclaurin who oversaw their construction. Designed by William Welles Bosworth , these imposing buildings were built of reinforced concrete ,
7729-466: The Swiss scientist Aimé Argand revolutionized lighthouse illumination with its steady smokeless flame. Early models used ground glass which was sometimes tinted around the wick. Later models used a mantle of thorium dioxide suspended over the flame, creating a bright, steady light. The Argand lamp used whale oil , colza , olive oil or other vegetable oil as fuel, supplied by a gravity feed from
7860-538: The US Air Force , and 1 foreign head of state have been affiliated with MIT. The institute also has a strong entrepreneurial culture and MIT alumni have founded or co-founded many notable companies. MIT is a member of the Association of American Universities . [...] a school of industrial science aiding the advancement, development and practical application of science in connection with arts, agriculture, manufactures, and commerce [...] Act to Incorporate
7991-405: The United Kingdom and Ireland about a third of lighthouses had been converted from filament light sources to use LEDs, and conversion continued with about three per year. The light sources are designed to replicate the colour and character of the traditional light as closely as possible. The change is often not noticed by people in the region, but sometimes a proposed change leads to calls to preserve
SECTION 60
#17327807091758122-643: The United States in protests and setting up encampments against the Israel–Hamas war . Student likened their actions to the historic protests against the American invasion of Vietnam and MIT investment’s in South African apartheid ; they called for ending ties to the Israeli Ministry of Defense . MIT's 166-acre (67.2 ha) campus in the city of Cambridge spans approximately
8253-495: The added advantage of allowing some of the energy of the waves to dissipate on impact with the walls. His lighthouse was the prototype for the modern lighthouse and influenced all subsequent engineers. One such influence was Robert Stevenson , himself a seminal figure in the development of lighthouse design and construction. His greatest achievement was the construction of the Bell Rock Lighthouse in 1810, one of
8384-474: The area known as the "Ghost Walk" 6 or 7 miles (11 km) to the east. When the USS ; Alacrity (SP-206) was wrecked on the ice-covered ledges off the island on February 3, 1918, Keeper Jennings and his assistants made four attempts to shoot a rope to the doomed ship but each time the rope parted. Jennings brought the lighthouse dory to the shore, and, assisted by two naval reservists, pushed it over
8515-408: The arts and sciences. In 2010, it was dubbed "most selective" by U.S. News , admitting few transfer students and 4.1% of its applicants in the 2020–2021 admissions cycle. It is need-blind for both domestic and international applicants. MIT offers 44 undergraduate degrees across its five schools. In the 2017–2018 academic year, 1,045 Bachelor of Science degrees (abbreviated " SB ") were granted,
8646-491: The beam was too narrow to be seen easily. In any of these designs an observer, rather than seeing a continuous weak light, sees a brighter light during short time intervals. These instants of bright light are arranged to create a light characteristic or pattern specific to a lighthouse. For example, the Scheveningen Lighthouse flashes are alternately 2.5 and 7.5 seconds. Some lights have sectors of
8777-540: The boundaries of their profession, those who have contributed to building bridges across the community, and those who consistently and selflessly perform acts of kindness". In September 2017, the school announced the creation of an artificial intelligence research lab called the MIT-IBM Watson AI Lab. IBM will spend $ 240 million over the next decade, and the lab will be staffed by MIT and IBM scientists. In October 2018 MIT announced that it would open
8908-734: The budget, new programs, degrees and faculty appointments, and elects a president to manage the university and preside over the Institute's faculty. The current president is Sally Kornbluth , a cell biologist and former provost at Duke University , who became MIT's eighteenth president in January 2023. MIT has five schools ( Science , Engineering , Architecture and Planning , Management , and Humanities, Arts, and Social Sciences ) and one college ( Schwarzman College of Computing ), but no schools of law or medicine. While faculty committees assert substantial control over many areas of MIT's curriculum, research, student life, and administrative affairs,
9039-636: The campus, the Institute has also extensively renovated existing buildings to improve their energy efficiency. MIT has also taken steps to reduce its environmental impact by running alternative fuel campus shuttles, subsidizing public transportation passes , constructing solar power offsets , and building a cogeneration plant to power campus electricity, heating, and cooling requirements. MIT has substantial commercial real estate holdings in Cambridge on which it pays property taxes , plus an additional voluntary payment in lieu of taxes (PILOT) on academic buildings which are legally tax-exempt. As of 2017 , it
9170-549: The campus: new dormitories and athletics buildings on west campus; the Tang Center for Management Education ; several buildings in the northeast corner of campus supporting research into biology , brain and cognitive sciences , genomics , biotechnology , and cancer research ; and a number of new "backlot" buildings on Vassar Street including the Stata Center . Construction on campus in the 2000s included expansions of
9301-551: The chair of each of MIT's 32 academic departments reports to the dean of that department's school, who in turn reports to the Provost under the President. Academic departments are also evaluated by "Visiting Committees," specialized bodies of Corporation members and outside experts who review the performance, activities, and needs of each department. MIT's endowment , real estate, and other financial assets are managed through by
9432-406: The choice of light sources, mountings, reflector design, the use of Fresnel lenses , and in rotation and shuttering systems providing lighthouses with individual signatures allowing them to be identified by seafarers. He also invented the movable jib and the balance-crane as a necessary part for lighthouse construction. Alexander Mitchell designed the first screw-pile lighthouse – his lighthouse
9563-533: The collapse of the Soviet government in 1990s, most of the official records on the locations, and condition, of these lighthouses were reportedly lost. Over time, the condition of RTGs in Russia degraded; many of them fell victim to vandalism and scrap metal thieves, who may not have been aware of the dangerous radioactive contents. Energy-efficient LED lights can be powered by solar panels , with batteries instead of
9694-488: The construction of lenses of large aperture and short focal length , without the mass and volume of material that would be required by a lens of conventional design. A Fresnel lens can be made much thinner than a comparable conventional lens, in some cases taking the form of a flat sheet. A Fresnel lens can also capture more oblique light from a light source, thus allowing the light from a lighthouse equipped with one to be visible over greater distances. The first Fresnel lens
9825-491: The country gathered at MIT's Radiation Laboratory , established in 1940 to assist the British military in developing microwave radar . The work done there significantly affected both the war and subsequent research in the area. Other defense projects included gyroscope -based and other complex control systems for gunsight , bombsight , and inertial navigation under Charles Stark Draper 's Instrumentation Laboratory ;
9956-691: The development of a digital computer for flight simulations under Project Whirlwind ; and high-speed and high-altitude photography under Harold Edgerton . By the end of the war, MIT became the nation's largest wartime R&D contractor (attracting some criticism of Bush), employing nearly 4000 in the Radiation Laboratory alone and receiving in excess of $ 100 million ($ 1.2 billion in 2015 dollars) before 1946. Work on defense projects continued even after then. Post-war government-sponsored research at MIT included SAGE and guidance systems for ballistic missiles and Project Apollo . ...
10087-625: The development of the lighthouse. In antiquity, the lighthouse functioned more as an entrance marker to ports than as a warning signal for reefs and promontories , unlike many modern lighthouses. The most famous lighthouse structure from antiquity was the Pharos of Alexandria , Egypt , which collapsed following a series of earthquakes between 956 and 1323. The intact Tower of Hercules at A Coruña , Spain gives insight into ancient lighthouse construction; other evidence about lighthouses exists in depictions on coins and mosaics, of which many represent
10218-553: The dormitory system starting in 2002. Because FSILGs had previously housed as many as 300 freshmen off-campus, the new policy could not be implemented until Simmons Hall opened in that year. In 2013–2014, MIT abruptly closed and then demolished undergrad dorm Bexley Hall, citing extensive water damage that made repairs infeasible. In 2017, MIT shut down Senior House after a century of service as an undergrad dorm. That year, MIT administrators released data showing just 60% of Senior House residents had graduated in four years. Campus-wide,
10349-473: The emitted light into a concentrated beam, thereby greatly increasing the light's visibility. The ability to focus the light led to the first revolving lighthouse beams, where the light would appear to the mariners as a series of intermittent flashes. It also became possible to transmit complex signals using the light flashes. French physicist and engineer Augustin-Jean Fresnel developed the multi-part Fresnel lens for use in lighthouses. His design allowed for
10480-412: The entrance into a harbor, such as New London Harbor Light . Where a tall cliff exists, a smaller structure may be placed on top such as at Horton Point Light . Sometimes, such a location can be too high, for example along the west coast of the United States, where frequent low clouds can obscure the light. In these cases, lighthouses are placed below the clifftop to ensure that they can still be seen at
10611-560: The expanding university. By the 1950s, MIT no longer simply benefited the industries with which it had worked for three decades, and it had developed closer working relationships with new patrons, philanthropic foundations and the federal government. In late 1960s and early 1970s, student and faculty activists protested against the Vietnam War and MIT's defense research. In this period MIT's various departments were researching helicopters, smart bombs and counterinsurgency techniques for
10742-474: The first academic buildings complete, the MIT administration and the MIT charter crossed the Charles River on the ceremonial barge Bucentaur built for the occasion. Institute faculty continued to debate whether the Institute education should continue to emphasize "hands on" industrial training or scientific research. Needing funds to match Eastman's gift and cover retreating state support, President Richard MacLaurin launched an industry funding model known as
10873-548: The four-year graduation rate is 84% (the cumulative graduation rate is significantly higher). MIT is a publicly-chartered nonprofit corporation governed by a privately appointed board known as the MIT Corporation . A large board since MIT's founding, the Corporation has 60–80 members at any time, some with fixed terms, some with life appointments, and eight who serve ex officio . The Corporation approves
11004-641: The great majority of its courses available online for no charge, though without any formal accreditation for coursework completed. While the cost of supporting and hosting the project is high, OCW expanded in 2005 to include other universities as a part of the OpenCourseWare Consortium, which currently includes more than 250 academic institutions with content available in at least six languages. In 2011, MIT announced it would offer formal certification (but not credits or degrees) to online participants completing coursework in its "MITx" program, for
11135-407: The harbor for the next three years. In 1751 the lighthouse was badly damaged by fire so that only the walls remained. In 1774 the British took over the island and in 1775 the harbor was blocked and the lighthouse became useless. On July 20, 1775, a small detachment of American troops under Major Voss visited the island and burned the wooden parts of the lighthouse. The British began to repair it under
11266-404: The ice and into the surf. Twenty-four men were clinging to the wreck in perilous positions when he reached it after a dangerous trip. Flinging a line aboard, they began the rescue of the half-frozen sailors, four times running the gauntlet of ice, rocks, and surf until all 24 men were saved. For this Jennings received a letter of commendation from Secretary Redfield . During World War II the light
11397-478: The island and lighthouse are available. They are also available through the National Park Service. The lighthouse underwent major renovations in 2014 and was covered with scaffolding. It reopened to visitors in 2015. Lighthouse Lighthouses mark dangerous coastlines, hazardous shoals , reefs , rocks, and safe entries to harbors; they also assist in aerial navigation . Once widely used,
11528-455: The lantern room where the light operates. The lantern room is the glassed-in housing at the top of a lighthouse tower containing the lamp and lens. Its glass storm panes are supported by metal muntins (glazing bars) running vertically or diagonally. At the top of the lantern room is a stormproof ventilator designed to remove the smoke of the lamps and the heat that builds in the glass enclosure. A lightning rod and grounding system connected to
11659-535: The light is concentrated, if needed, by the "lens" or "optic". Power sources for lighthouses in the 20th–21st centuries vary. Originally lit by open fires and later candles, the Argand hollow wick lamp and parabolic reflector were introduced in the late 18th century. Whale oil was also used with wicks as the source of light. Kerosene became popular in the 1870s and electricity and acetylene gas derived on-site from calcium carbide began replacing kerosene around
11790-509: The lighthouse at Ostia . Coins from Alexandria, Ostia, and Laodicea in Syria also exist. The modern era of lighthouses began at the turn of the 18th century, as the number of lighthouses being constructed increased significantly due to much higher levels of transatlantic commerce. Advances in structural engineering and new and efficient lighting equipment allowed for the creation of larger and more powerful lighthouses, including ones exposed to
11921-485: The lighthouse boat capsized as they were returning to the island from Boston. Young Benjamin Franklin , then a printer in Boston, wrote a ballad about the incident entitled "Lighthouse Tragedy" and sold it on the streets of Boston. The pay of Keeper John Hayes was raised to £70 in 1718 so that he would not be obliged to entertain mariners on the island for extra money which he found " prejudicial to himself as well as to
12052-469: The lighthouse keepers. Efficiently concentrating the light from a large omnidirectional light source requires a very large diameter lens. This would require a very thick and heavy lens if a conventional lens were used. The Fresnel lens (pronounced / f r eɪ ˈ n ɛ l / ) focused 85% of a lamp's light versus the 20% focused with the parabolic reflectors of the time. Its design enabled construction of lenses of large size and short focal length without
12183-484: The lighthouse. In 1783 the Massachusetts Legislature supplied £1,450 to erect a new lighthouse on the site of the old. This new lighthouse was 75 feet (23 m) high with walls 7 feet 6 inches (2.29 m) thick at the base, tapering to 2 feet 6 inches (0.76 m) at the top. The octagonal lantern was 15 feet (4.6 m) high and 8 feet (2.4 m) in diameter. Thomas Knox
12314-470: The luminosity of traditional oil lights. The use of gas as illuminant became widely available with the invention of the Dalén light by Swedish engineer Gustaf Dalén . He used Agamassan (Aga), a substrate , to absorb the gas, allowing the gas to be stored, and hence used, safely. Dalén also invented the ' sun valve ', which automatically regulated the light and turned it off during the daytime. The technology
12445-548: The men participated in fraternities and 20% of the women were involved in sororities. Most FSILGs are located across the river in Back Bay near where MIT was founded, and there is also a cluster of fraternities on MIT's West Campus that face the Charles River Basin. After the 1997 alcohol-related death of Scott Krueger, a new pledge at the Phi Gamma Delta fraternity, MIT required all freshmen to live in
12576-421: The metal cupola roof provides a safe conduit for any lightning strikes. Immediately beneath the lantern room is usually a Watch Room or Service Room where fuel and other supplies were kept and where the keeper prepared the lanterns for the night and often stood watch. The clockworks (for rotating the lenses) were also located there. On a lighthouse tower, an open platform called the gallery is often located outside
12707-496: The most impressive feats of engineering of the age. This structure was based upon Smeaton's design, but with several improved features, such as the incorporation of rotating lights, alternating between red and white. Stevenson worked for the Northern Lighthouse Board for nearly fifty years during which time he designed and oversaw the construction and later improvement of numerous lighthouses. He innovated in
12838-446: The most popular department, collectively identify themselves as "Course 6". MIT students use a combination of the department's course number and the number assigned to the class to identify their subjects; for instance, the introductory calculus-based classical mechanics course is simply "8.01" (pronounced eight-oh-one ) at MIT. The four-year, full-time undergraduate program maintains a balance between professional majors and those in
12969-439: The most powerful university-based nuclear reactors in the United States. The prominence of the reactor's containment building in a densely populated area has been controversial, but MIT maintains that it is well-secured. MIT Nano, also known as Building 12, is an interdisciplinary facility for nanoscale research. Its 100,000 sq ft (9,300 m ) cleanroom and research space, visible through expansive glass facades,
13100-702: The names of important scientists and philosophers. The spacious Building 7 atrium at 77 Massachusetts Avenue is regarded as the entrance to the Infinite Corridor and the rest of the campus. Alvar Aalto 's Baker House (1947), Eero Saarinen 's MIT Chapel and Kresge Auditorium (1955), and I.M. Pei 's Green , Dreyfus, Landau, and Wiesner buildings represent high forms of post-war modernist architecture . More recent buildings like Frank Gehry 's Stata Center (2004), Steven Holl 's Simmons Hall (2002), Charles Correa 's Building 46 (2005), and Fumihiko Maki 's Media Lab Extension (2009) stand out among
13231-402: The number of operational lighthouses has declined due to the expense of maintenance and the advent of much cheaper, more sophisticated, and more effective electronic navigational systems. Before the development of clearly defined ports , mariners were guided by fires built on hilltops. Since elevating the fire would improve visibility, placing the fire on a platform became a practice that led to
13362-477: The only second-order Fresnel lens still in use in Massachusetts (of only four total), and is visible from a distance of 27 nautical miles (50 km; 31 mi). Although it is still an important navigation mark, its importance has been decreased over the last century by the use of Boston Harbor's North Channel for most large vessels entering the harbor, which is marked by Graves Light . Guided tours of
13493-399: The order in which the buildings were built and their location relative (north, west, and east) to the original center cluster of Maclaurin buildings. Many of the buildings are connected above ground as well as through an extensive network of tunnels, providing protection from the Cambridge weather as well as a venue for roof and tunnel hacking . MIT's on-campus nuclear reactor is one of
13624-556: The pace of life at the Institute" to match the return to peacetime, remembering the "academic tranquility of the prewar years", though acknowledging the significant contributions of military research to the increased emphasis on graduate education and rapid growth of personnel and facilities. The faculty doubled and the graduate student body quintupled during the presidential terms of Karl Taylor Compton (1930–1948), James Rhyne Killian (1948–1957), and chancellor Julius Adams Stratton (1952–1957), whose institution-building strategies shaped
13755-905: The preferences of the students themselves, diverse social atmospheres can be sustained in different living groups; for example, according to the Yale Daily News staff's The Insider's Guide to the Colleges, 2010 , "The split between East Campus and West Campus is a significant characteristic of MIT. East Campus has gained a reputation as a thriving counterculture." MIT also has 5 dormitories for single graduate students and 2 apartment buildings on campus for married student families. MIT has an active Greek and co-op housing system, including thirty-six fraternities , sororities , and independent living groups ( FSILGs ). As of 2015 , 98% of all undergraduates lived in MIT-affiliated housing; 54% of
13886-637: The protests. The student body, faculty, and administration remained comparatively unpolarized during what was a tumultuous time for many other universities. Johnson was seen to be highly successful in leading his institution to "greater strength and unity" after these times of turmoil. However six MIT students were sentenced to prison terms at this time and some former student leaders, such as Michael Albert and George Katsiaficas , are still indignant about MIT's role in military research and its suppression of these protests. ( Richard Leacock 's film, November Actions , records some of these tumultuous events. ) In
14017-465: The sea. The function of lighthouses was gradually changed from indicating ports to the providing of a visible warning against shipping hazards, such as rocks or reefs. The Eddystone Rocks were a major shipwreck hazard for mariners sailing through the English Channel . The first lighthouse built there was an octagonal wooden structure, anchored by 12 iron stanchions secured in the rock, and
14148-451: The seabed and a low wooden structure is placed above the open framework, such as Thomas Point Shoal Lighthouse . As screw piles can be disrupted by ice, steel caisson lighthouses such as Orient Point Light are used in cold climates. Orient Long Beach Bar Light (Bug Light) is a blend of a screw pile light that was converted to a caisson light because of the threat of ice damage. Skeletal iron towers with screw-pile foundations were built on
14279-554: The siege of Atlanta, designed and built some of the most exotic lighthouses in the most difficult locations on the U.S. Great Lakes . French merchant navy officer Marius Michel Pasha built almost a hundred lighthouses along the coasts of the Ottoman Empire in a period of twenty years after the Crimean War (1853–1856). In a lighthouse, the source of light is called the "lamp" (whether electric or fuelled by oil) and
14410-674: The size of the student body increased to more than one thousand. The curriculum drifted to a vocational emphasis, with less focus on theoretical science. The fledgling school still suffered from chronic financial shortages which diverted the attention of the MIT leadership. During these "Boston Tech" years, MIT faculty and alumni rebuffed Harvard University president (and former MIT faculty) Charles W. Eliot 's repeated attempts to merge MIT with Harvard College's Lawrence Scientific School . There would be at least six attempts to absorb MIT into Harvard. In its cramped Back Bay location, MIT could not afford to expand its overcrowded facilities, driving
14541-526: The spring semester commencing in early February and ceasing in late May. MIT students refer to both their majors and classes using numbers or acronyms alone. Departments and their corresponding majors are numbered in the approximate order of their foundation; for example, Civil and Environmental Engineering is Course 1 , while Linguistics and Philosophy is Course 24 . Students majoring in Electrical Engineering and Computer Science (EECS),
14672-427: The successive terms of the more humanistically oriented presidents Howard W. Johnson and Jerome Wiesner between 1966 and 1980. MIT's involvement in military science surged during World War II . In 1941, Vannevar Bush was appointed head of the federal Office of Scientific Research and Development and directed funding to only a select group of universities, including MIT. Engineers and scientists from across
14803-528: The surface during periods of fog or low clouds, as at Point Reyes Lighthouse . Another example is in San Diego , California : the Old Point Loma lighthouse was too high up and often obscured by fog, so it was replaced in 1891 with a lower lighthouse, New Point Loma lighthouse . As technology advanced, prefabricated skeletal iron or steel structures tended to be used for lighthouses constructed in
14934-599: The third and most famous Eddystone Lighthouse , but some builders are well known for their work in building multiple lighthouses. The Stevenson family ( Robert , Alan , David , Thomas , David Alan , and Charles ) made lighthouse building a three-generation profession in Scotland. Richard Henry Brunton designed and built 26 Japanese lighthouses in Meiji Era Japan, which became known as Brunton's "children". Blind Irishman Alexander Mitchell invented and built
15065-448: The town of Boston. " In 1719 he asked " That a great Gun may be placed on Said Island to answer Ships in a Fogg " and one was supplied that year on which the date 1700 was engraved. The gun is shown on a mezzotint engraving of Boston Light made by Burgess in 1729. Hayes’ successor in 1734 was Robert Ball who petitioned the general court for preference in piloting vessels into the harbor. The court designated him as an "established pilot" of
15196-486: The traditional light, including in some cases a rotating beam. A typical LED system designed to fit into the traditional 19th century Fresnel lens enclosure was developed by Trinity House and two other lighthouse authorities and costs about € 20,000, depending on configuration, according to a supplier; it has large fins to dissipate heat. Lifetime of the LED light source is 50,000 to 100,000 hours, compared to about 1,000 hours for
15327-480: The turn of the 20th century. Carbide was promoted by the Dalén light , which automatically lit the lamp at nightfall and extinguished it at dawn. In the second half of the 20th century, many remote lighthouses in Russia (then Soviet Union ) were powered by radioisotope thermoelectric generators (RTGs). These had the advantage of providing power day or night and did not need refuelling or maintenance. However, after
15458-588: The war in Vietnam as well as guidance systems for nuclear missiles. The Union of Concerned Scientists was founded on March 4, 1969 during a meeting of faculty members and students seeking to shift the emphasis on military research toward environmental and social problems. MIT ultimately divested itself from the Instrumentation Laboratory and moved all classified research off-campus to the MIT Lincoln Laboratory facility in 1973 in response to
15589-535: The watch room (called the Main Gallery) or Lantern Room (Lantern Gallery). This was mainly used for cleaning the outside of the windows of the Lantern Room. Lighthouses near to each other that are similar in shape are often painted in a unique pattern so they can easily be recognized during daylight, a marking known as a daymark . The black and white barber pole spiral pattern of Cape Hatteras Lighthouse
15720-643: The weight and volume of material in conventional lens designs. Fresnel lighthouse lenses are ranked by order , a measure of refracting power, with a first order lens being the largest, most powerful and expensive; and a sixth order lens being the smallest. The order is based on the focal length of the lens. A first order lens has the longest focal length, with the sixth being the shortest. Coastal lighthouses generally use first, second, or third order lenses, while harbor lights and beacons use fourth, fifth, or sixth order lenses. Some lighthouses, such as those at Cape Race , Newfoundland, and Makapuu Point , Hawaii, used
15851-437: Was a kerosene lamp or, earlier, an animal or vegetable oil Argand lamp, and the lenses rotated by a weight driven clockwork assembly wound by lighthouse keepers, sometimes as often as every two hours. The lens assembly sometimes floated in liquid mercury to reduce friction. In more modern lighthouses, electric lights and motor drives were used, generally powered by diesel electric generators. These also supplied electricity for
15982-556: Was appointed keeper. On June 10, 1790, the Boston Light was ceded to the new Federal Government. In 1856, the height of the tower was raised to 98 feet (30 m) and it was listed as a second-order station. In 1893 the Massachusetts Institute of Technology sent 20 or 30 students to live on the island, while experiments were made with various types of foghorns in an endeavor to find one that would penetrate
16113-518: Was attacked and burnt on two occasions by American forces. As the British forces withdrew in 1776, they blew up the tower and completely destroyed it. The lighthouse was eventually reconstructed in 1783, to the same 75-foot (23 m) height as the original tower. In 1856 it was raised to its present height of 98 feet (30 m) and a new lantern room was added along with a 12-sided second order Fresnel lens . The first lighthouse established in America
16244-459: Was built by Henry Winstanley from 1696 to 1698. His lighthouse was the first tower in the world to have been fully exposed to the open sea. The civil engineer John Smeaton rebuilt the lighthouse from 1756 to 1759; his tower marked a major step forward in the design of lighthouses and remained in use until 1877. He modeled the shape of his lighthouse on that of an oak tree , using granite blocks. He rediscovered and used " hydraulic lime ",
16375-683: Was built on piles that were screwed into the sandy or muddy seabed. Construction of his design began in 1838 at the mouth of the Thames and was known as the Maplin Sands lighthouse, and first lit in 1841. Although its construction began later, the Wyre Light in Fleetwood, Lancashire, was the first to be lit (in 1840). Until 1782 the source of illumination had generally been wood pyres or burning coal. The Argand lamp , invented in 1782 by
16506-514: Was designed and constructed by a team of scientists from California Institute of Technology , MIT, and industrial contractors, and funded by the National Science Foundation . It was designed to open the field of gravitational-wave astronomy through the detection of gravitational waves predicted by general relativity . Gravitational waves were detected for the first time by the LIGO detector in 2015. For contributions to
16637-610: Was extinguished as a security measure but was again placed in operation on July 2, 1945. The station is equipped with a 1,800,000 candlepower light visible for 27 nautical miles (50 km). Boston Light was automated in 1998, but was staffed by resident Coast Guard keeper, Sally Snowman until December 30, 2023. She has been assisted by Auxiliarist watchstanders from the Coast Guard Auxiliary . These personnel perform maintenance and act as interpretive tour guides. Its light, flashing white every 10 seconds, shines through
16768-402: Was killed. Major Tupper and his men were commended by General Washington. When the British left Boston, March 17, 1776, a number of their ships remained in the harbor. On June 13, 1776, American soldiers landed on Long Island, Boston Harbor, and at Nantasket Hill and opened fire on this fleet. Before sailing away, the British sent a boat ashore at Boston Light and left a time charge which blew up
16899-476: Was on Little Brewster Island in Boston Harbor and was first lit September 14, 1716. A tonnage tax of 1 penny per ton on all vessels, except coasters, moving in or out of Boston Harbor, paid for maintaining the light. The first keeper, George Worthylake , with a salary of £50 a year, also acted as pilot for vessels entering the harbor. In 1718 he and his wife and daughter, with two men, were drowned when
17030-506: Was the predominant light source in lighthouses from the 1900s to the 1960s, when electric lighting had become dominant. With the development of the steady illumination of the Argand lamp, the application of optical lenses to increase and focus the light intensity became a practical possibility. William Hutchinson developed the first practical optical system in 1777, known as a catoptric system. This rudimentary system effectively collimated
17161-598: Was used in 1823 in the Cordouan lighthouse at the mouth of the Gironde estuary ; its light could be seen from more than 20 miles (32 km) out. Fresnel's invention increased the luminosity of the lighthouse lamp by a factor of four and his system is still in common use. The introduction of electrification and automatic lamp changers began to make lighthouse keepers obsolete. For many years, lighthouses still had keepers, partly because lighthouse keepers could serve as
#174825