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  • Trachipterus (fish)

    Dealfish, any of several slender marine fishes that belong to the genus Trachipterus (family Trachipteridae, order Lampridiformes), a subgroup of the ribbonfish. The dealfish inhabits the middle waters, probably not below 400 m (1,300 feet), and is characterized by a long, laterally compressed

  • Trachodon (dinosaur genus)

    Anatosaurus, (genus Anatosaurus), bipedal duck-billed dinosaurs (hadrosaurs) of the Late Cretaceous Period, commonly found as fossils in North American rocks 70 million to 65 million years old. Related forms such as Edmontosaurus and Shantungosaurus have been found elsewhere in the Northern

  • trachodont (dinosaur)

    dinosaur: Ornithopoda: …reached a pinnacle in the hadrosaurs, or duck-billed ornithopods. In this group a very prominent, robust projection jutted from the back of the stout lower jaw. Large chambers housing muscles were present above this process and beneath certain openings in the skull (the lateral and upper temporal fenestrae). These chambers…

  • trachoma (disease)

    Trachoma, chronic inflammatory disease of the eye caused by Chlamydia trachomatis, a bacterium-like microorganism that grows only within tissue cells of the infected host. The conjunctiva becomes thickened and roughened, and deformation may result. Extension of inflammation to the cornea occurs in

  • Trachonitis (region, Syria)

    Al-Lajā?, (Arabic: “Refuge”) volcanic region in southern Syria known for its unique and rugged topography and for its numerous archaeological ruins. Al-Lajā?, some 30 miles (50 km) southeast of Damascus, is somewhat triangular in shape, with its apex near Burāq and its base drawn roughly between

  • Trachops cirrhosus (mammal)

    Fringe-lipped bat, (Trachops cirrhosus), a species of bat characterized by the fleshy tubercules that cover its chin. The fringe-lipped bat is widespread in tropical lowland forests of Central and South America. It has large feet with robust claws, a well-developed membrane between its legs, and

  • trachyandesite (geology)

    Latite, extrusive igneous rock very abundant in western North America. Usually coloured white, yellowish, pinkish, or gray, it is the volcanic equivalent of monzonite (q.v.). Latites contain plagioclase feldspar (andesine or oligoclase) as large, single crystals (phenocrysts) in a fine-grained

  • Trachycarpus (plant genus)

    palm: Evolution: Serenoa, Livistona, Trachycarpus, and Oncosperma, existed in the United States, Canada, India, Europe, and China, many in places where palms do not occur today. These genera include members of groups considered primitive and specialized within the family and appear to represent an early burst of radiation and…

  • Trachylina (invertebrate order)

    cnidarian: Evolution: …ancient of cnidarian classes, and Trachylina is thought to be the most primitive extant order of that group. An alternative view is that anthozoans are the stem of the phylum, which evolved from bilateral flatworms and is secondarily simplified. A corollary to this theory is that the polyp is the…

  • Trachylobium verrucosum (plant)

    copal: …is the fossil yielded by Trachylobium verrucosum; it is found embedded in the earth over a wide belt of East Africa on the western coast of Zanzibar on tracts where not a tree is now visible. South American copals are available from the Hymenaea courbaril and other species of trees…

  • Trachymedusae (cnidarian suborder)

    cnidarian: Annotated classification: Suborder Trachymedusae Smooth bell margin; gonads on radial canals arising from the stomach. Polyp and asexual reproduction absent. Class Scyphozoa Exclusively marine group in which acraspedote medusae predominate. Life histories commonly involve alternation of a very small polyp, the scyphistoma, with a medusa, which develops from…

  • Trachypachidae (insect family)

    coleopteran: Annotated classification: Family Trachypachidae A few species in Europe and North America. Suborder Archostemata Hind coxae rarely fused to metasternum; distinct notopleural suture between notum and pleural sclerites. Family Crowsoniellidae 1 species,

  • Trachypithecus francoisi (primate)

    langur: …the head and body, including Fran?ois’ langur (T. francoisi) and its relatives, which live in the limestone country of northern Vietnam, Laos, and parts of southeastern China (Kwangsi). The purple-faced langur (T. vetulus) of Sri Lanka and the rare Nilgiri langur (T. johnii) of southern India may be more closely…

  • Trachypithecus geei (primate)

    langur: …15 species, including the beautiful golden langur (T. geei) from Bhutan, the spectacled langur (T. obscurus) from the Malay Peninsula, with white eye rings and pink muzzle, and a group of black langurs with white markings on the head and body, including Fran?ois’ langur (T. francoisi) and its relatives, which…

  • Trachypithecus obscurus (primate)

    langur: geei) from Bhutan, the spectacled langur (T. obscurus) from the Malay Peninsula, with white eye rings and pink muzzle, and a group of black langurs with white markings on the head and body, including Fran?ois’ langur (T. francoisi) and its relatives, which live in the limestone country of northern…

  • trachyte (rock)

    Trachyte, light-coloured, very fine-grained extrusive igneous rock that is composed chiefly of alkali feldspar with minor amounts of dark-coloured minerals such as biotite, amphibole, or pyroxene. Compositionally, trachyte is the volcanic equivalent of the plutonic (intrusive) rock syenite. Most

  • Tracing the History of Horse Evolution and Domestication

    New clues to the origins of the horse and the spread of its domestication were presented in 2012 by a multinational team of scientists led by Vera Warmuth of the University of Cambridge. In their bid to piece together the genetic structure of the wild horse (Equus ferus) and to determine the

  • track

    railroad: Railroad track and roadway: Ideally, a railroad should be built in a straight line, over level ground, between large centres of trade and travel. In practice, this ideal is rarely approached. The location engineer, faced with the terrain to be traversed, must…

  • track and field

    Athletics, a variety of competitions in running, walking, jumping, and throwing events. Although these contests are called track and field (or simply track) in the United States, they are generally designated as athletics elsewhere. This article covers the history, the organization, and the

  • track athletics (athletics)

    Running, footracing over a variety of distances and courses and numbering among the most popular sports in nearly all times and places. Modern competitive running ranges from sprints (dashes), with their emphasis on continuous high speed, to grueling long-distance and marathon races, requiring

  • track detection (physics)

    pair production: …pair production occurs in a track detector, such as a cloud chamber, to which a magnetic field is properly applied, the electron and the positron curve away from the point of formation in opposite directions in arcs of equal curvature. In this way pair production was first detected (1933). The…

  • track detector (physics)

    pair production: …pair production occurs in a track detector, such as a cloud chamber, to which a magnetic field is properly applied, the electron and the positron curve away from the point of formation in opposite directions in arcs of equal curvature. In this way pair production was first detected (1933). The…

  • track event (athletics)

    Running, footracing over a variety of distances and courses and numbering among the most popular sports in nearly all times and places. Modern competitive running ranges from sprints (dashes), with their emphasis on continuous high speed, to grueling long-distance and marathon races, requiring

  • Track of the Cat (film by Wellman [1954])

    William Wellman: Films of the 1950s: The ambitious, arty Track of the Cat (1954), starring Mitchum, was a moody psychological western in which Wellman used colour cinematography but limited his palette almost exclusively to black, white, gray, and brown. Blood Alley (1955) pitted Wayne and Lauren Bacall against Chinese communists, and Good-bye, My Lady…

  • Track of the Cat, The (work by Clark)

    Walter van Tilburg Clark: The Track of the Cat (1949), a tale of a hunt for a black panther during a blizzard, is a moral parable. Clark’s “The Portable Phonograph,” which imagines the aftermath of a devastating war, was published in the short-story collection The Watchful Gods (1950) and…

  • track-and-field sports

    Athletics, a variety of competitions in running, walking, jumping, and throwing events. Although these contests are called track and field (or simply track) in the United States, they are generally designated as athletics elsewhere. This article covers the history, the organization, and the

  • track-etch detector (physics)

    radiation measurement: Track-etch detectors: When a charged particle slows down and stops in a solid, the energy that it deposits along its track can cause permanent damage in the material. It is difficult to observe direct evidence of this local damage, even under careful microscopic examination. In…

  • track-via-missile (military technology)

    rocket and missile system: Command: Patriot surface-to-air system was called track-via-missile. In this system a radar unit in the missile tracked the target and transmitted relative bearing and velocity information to the launch site, where control systems computed the optimal trajectory for intercepting the target and sent appropriate commands back to the missile.

  • track-while-scan radar (radar technology)

    radar: Interference: …not as easily ignored by automatic detection and tracking systems, however, and so some method is usually needed to recognize and remove interference pulses before they enter the automatic detector and tracker of a radar.

  • trackball (input device)

    computer: Input devices: Mechanical mice and trackballs operate alike, using a rubber or rubber-coated ball that turns two shafts connected to a pair of encoders that measure the horizontal and vertical components of a user’s movement, which are then translated into cursor movement on a computer monitor. Optical mice employ a…

  • tracked landing vehicle

    amphibious vehicle: The LVT resembled a tank, whereas the DUKW moved on rubber tires ashore and was propeller-driven when afloat. Each began its operational life as little more than a floating truck. The rigours of combat demonstrated the need for armour plating, however, and the LVT, with the…

  • tracker action (musical instrument)

    Tracker action, in music, on the organ, mechanical system that transmits the organist’s action in depressing a key to the pallet valve that admits air into the pipes that the key controls. It consists of cranks, levers, and trackers (thin strips of wood connecting, under tension, parts of the

  • Trackers (play by Sophocles)

    Trackers, satyr play by Sophocles. It is based on two stories about the miraculous early deeds of the god Hermes: that the infant, growing to maturity in a few days, stole cattle from Apollo, baffling discovery by reversing the animals’ hoof marks; and that he invented the lyre by fitting strings

  • tracking (military technology)

    rocket and missile system: Command: tracking the projectile from the launch site or platform and transmitting commands by radio, radar, or laser impulses or along thin wires or optical fibres. Tracking might be accomplished by radar or optical instruments from the launch site or by radar or television imagery relayed…

  • tracking (education)

    Ability grouping, in the United States the separation of elementary and secondary students into classrooms or courses of instruction according to their actual or perceived ability levels. Opponents of ability grouping argue that such policies tend to segregate students along racial and

  • tracking (hunting)

    hunting: Hunting methods: …or still-hunted but must be tracked, a simple feat in soft ground and, for a skilled tracker, even on hard.

  • Tracking and Data Relay Satellite System (United States communications-satellite system)

    Tracking and Data Relay Satellite System (TDRSS), American system of ten communications satellites in geosynchronous orbit that relay signals between Earth-orbiting satellites and ground facilities located at White Sands, New Mexico; Greenbelt, Maryland; Blossom Point, Maryland; and on Guam. The

  • tracking radar (radar technology)

    radar: Directive antennas and target direction: A dedicated tracking radar—one that follows automatically a single target so as to determine its trajectory—generally has a narrow, symmetrical “pencil” beam. (A typical beamwidth might be about 1 degree.) Such a radar system can determine the location of the target in both azimuth angle and elevation…

  • tracking shot (cinematography)

    history of the motion picture: D.W. Griffith: …he would prominently employ the tracking, or traveling, shot, in which the camera—and therefore the audience—participates in the dramatic action by moving with it. In California, Griffith discovered that camera angle could be used to comment upon the content of a shot or to heighten its dramatic emphasis in a…

  • tracklaying tractor (vehicle)

    Caterpillar Inc.: …Manufacturing Company, invented the familiar “caterpillar” tractor in about 1906. The tractor ran on continuous metal-belted tracks instead of wheels, and the tracks kept the heavy vehicle from sinking in mud or dirt. The new machines were immediately successful as all-terrain haulers and graders, and the Holts opened a new…

  • trackless surgery (medicine)

    ultrasonics: Therapy and surgery: Trackless surgery—that is, surgery that does not require an incision or track from the skin to the affected area—has been developed for several conditions. Focused ultrasound has been used for the treatment of Parkinson’s disease by creating brain lesions in areas that are inaccessible to…

  • trackless trolley (vehicle)

    Trolleybus, vehicle operated on the streets on rubber tires and powered by electricity drawn from two overhead wires by trolley poles. It is distinct from a trolley car, which runs on rails rather than on tires and is thus a form of streetcar. In the late 1880s a number of small transit systems

  • Tracks (work by Davidson)

    Australian literature: Literature from 1970 to 2000: …interesting examples was Robyn Davidson’s Tracks (1982), an account of her trek across Australia with her camels. It is a shaped narrative, tracing her increasing awareness of the meaning and experience of the desert and leading toward self-discovery. Like the imaginative writers, she looked for a pattern of significance in…

  • Tracks (novel by Erdrich)

    Louise Erdrich: …includes The Beet Queen (1986), Tracks (1988), and The Bingo Palace (1994), about the Indian families living on or near a North Dakota Ojibwa reservation and the whites they encounter. Tales of Burning Love (1996) and The Antelope Wife (1998) detail tumultuous relationships between men and women and their aftermath.…

  • tracks (armoured vehicle)

    tank: …two endless metal chains called tracks. Tanks are essentially weapons platforms that make the weapons mounted in them more effective by their cross-country mobility and by the protection they provide for their crews. Weapons mounted in tanks have ranged from single rifle-calibre machine guns to, in recent years, long-barreled guns…

  • tract (nervous system)

    nervous system: The vertebrate system: …are organized in bundles called tracts, or fasciculi. Ascending tracts carry impulses along the spinal cord toward the brain, and descending tracts carry them from the brain or higher regions in the spinal cord to lower regions. The tracts are often named according to their origin and termination; for example,…

  • Tract (music)

    Gregorian chant: The Tract replaces the Alleluia in penitential times. This chant is a descendant of synagogue music.

  • tractable problem (computer science)

    NP-complete problem: So-called easy, or tractable, problems can be solved by computer algorithms that run in polynomial time; i.e., for a problem of size n, the time or number of steps needed to find the solution is a polynomial function of n. Algorithms for solving hard, or intractable, problems, on…

  • Tractarian (British religious history)

    John Keble: …advocates to be known as Tractarians. The Tractarians encouraged study of the early Church Fathers, edited their works, and arranged for their translation. When John Henry Newman’s conversion to Roman Catholicism in 1845 threatened the continuation of the Oxford Movement, Keble and E.B. Pusey managed by their persistence to keep…

  • Tractates on the Gospel of John (work by Augustine)

    St. Augustine: Sermons: …in evangelium Iohannis CXXIV (413–418?; Tractates on the Gospel of John), amounting to a full commentary on the most philosophical of the Gospel texts. Other sermons range over much of Scripture, but it is worth noting that Augustine had little to say about the prophets of the Old Testament, and…

  • Tractatus (work by Peter of Spain)

    history of logic: Developments in the 13th and early 14th centuries: …Tractatus more commonly known as Summulae logicales (“Little Summaries of Logic”) probably in the early 1230s; it was used as a textbook in some late medieval universities; (2) Lambert of Auxerre, who wrote a Logica sometime between 1253 and 1257; and (3) William of Sherwood, who produced Introductiones in logicam…

  • Tractatus Coislinianus (Greek literary theory)

    Tractatus Coislinianus, statement of a Greek theory of comedy found in a 10th-century manuscript (published 1839) in the collection of Henri Charles du Cambout de Coislin. The treatment of comedy displays marked Aristotelian influence, even to the point of paralleling the model offered in the

  • Tractatus de anima intellectiva (work by Siger de Brabant)

    Siger de Brabant: … (six exercises in sophistry), and Tractatus de anima intellectiva (“Treatise on the Intellectual Soul”). The last discusses his basic belief that there is only one “intellectual” soul for mankind and thus one will. Although this soul is eternal, individual human beings are not immortal. This view, though not lucidly expressed,…

  • Tractatus de Armis (work by John of Guildford)

    heraldry: Early writers: …Johannes de Bado Aureo, whose Tractatus de armis (“Treatise on Arms”) was produced about 1394. Then came a Welsh treatise by John Trevor, the Llyfr arfau (“Book of Arms”). Nicholas Upton, a canon of Salisbury Cathedral, about 1440 wrote De studio militari (“On Military Studies”). John of Guildford’s treatise was…

  • Tractatus de civili dominio (work by Wycliffe)

    John Wycliffe: Political activities and theories: …dominio divino libri tres and Tractatus de civili dominio), in which he argued men exercised “dominion” (the word is used of possession and authority) straight from God and that if they were in a state of mortal sin, then their dominion was in appearance only. The righteous alone could properly…

  • Tractatus de configurationibus qualitatum et motuum (work by Oresme)

    Nicholas Oresme: …mathematics are contained in his Tractatus de configurationibus qualitatum et motuum (“Treatise on the Configurations of Qualities and Motions”). In this work Oresme conceived of the idea of using rectangular coordinates (latitudo and longitudo) and the resulting geometric figures to distinguish between uniform and nonuniform distributions of various quantities, even…

  • Tractatus de Deo et Homine Ejusque Felicitate (work by Spinoza)

    Benedict de Spinoza: Rijnsburg and The Hague: …mensch en deszelfs welstand (Short Treatise on God, Man and His Well-Being), a brief survey of his overall philosophy. During this period he was also working on the Ethics, as his correspondence shows.

  • Tractatus de immortalitate animae (work by Pomponazzi)

    Pietro Pomponazzi: …the immortality of the soul, Tractatus de immortalitate animae (1516), was attacked but not officially condemned; and he was allowed to publish a defense of his position in his Apologia (1518) and Defensorium (1519).

  • Tractatus de immortalitate animae contra Pomponatium (work by Nifo)

    Agostino Nifo: …Pope Leo X, he wrote Tractatus de immortalitate animae contra Pomponatium (1518; “Treatise on the Immortality of the Soul Against Pomponazzi”) as a refutation of Pomponazzi’s view that the human soul is essentially a material organism dissolving at death. Nifo argued, in a polemic that amounted to a personal attack,…

  • Tractatus de Intellectus Emendatione (work by Spinoza)

    Benedict de Spinoza: Rijnsburg and The Hague: …1661 Spinoza began writing the Tractatus de Intellectus Emendatione (Treatise on the Emendation of the Intellect), a presentation of his theory of knowledge, which he left unfinished. In about 1662 he completed his only work in Dutch, Korte verhandeling van God, de mensch en deszelfs welstand (Short Treatise on God,…

  • Tractatus de legibus et consuetudinibus regni Angliae (work by Glanville)

    Ranulf de Glanville: …text on the common law, Tractatus de legibus et consuetudinibus regni Angliae (c. 1188; “Treatise on the Laws and Customs of the Kingdom of England”). This work greatly extended the scope of the common law at the expense of canon law and local law, and in English legal history the…

  • Tractatus de Methodis Serierum et Fluxionum (work by Newton)

    Newton and Infinite Series: …and he wrote in his Tractatus de Methodis Serierum et Fluxionum (1671; “Treatise on the Method of Series and Fluxions”):

  • Tractatus de primo principio (work by Duns Scotus)

    Blessed John Duns Scotus: Years at the University of Paris: The short but important Tractatus de primo principio, a compendium of what reason can prove about God, draws heavily upon the Ordinatio. The remaining authentic works seem to represent questions discussed privately for the benefit of the Franciscan student philosophers or theologians. They include, in addition to the Collationes…

  • Tractatus de Sectionibus Conicis (work by Wallis)

    John Wallis: In his Tractatus de Sectionibus Conicis (1659; “Tract on Conic Sections”), he described the curves that are obtained as cross sections by cutting a cone with a plane as properties of algebraic coordinates. His Mechanica, sive Tractatus de Motu (“Mechanics, or Tract on Motion”) in 1669–71 (three…

  • Tractatus in evangelium Iohannis (work by Augustine)

    St. Augustine: Sermons: …in evangelium Iohannis CXXIV (413–418?; Tractates on the Gospel of John), amounting to a full commentary on the most philosophical of the Gospel texts. Other sermons range over much of Scripture, but it is worth noting that Augustine had little to say about the prophets of the Old Testament, and…

  • Tractatus Logico-Philosophicus (work by Wittgenstein)

    philosophy of language: Wittgenstein’s Tractatus: In the Tractatus, sentences are treated as “pictures” of states of affairs. As in Frege’s system, the basic elements consist of referring expressions, or “logically proper” names, which pick out the simplest parts of states of affairs. The simplest propositions, called “elementary” or “atomic,”…

  • Tractatus super quattuor Evangelia (work by Joachim of Fiore)

    Joachim Of Fiore: …one uncompleted major work, the Tractatus super quattuor Evangelia (“Treatise on the Four Gospels”).

  • Tractatus Theologico-Politicus (work by Spinoza)

    Benedict de Spinoza: Tractatus Theologico-Politicus: The publication of the Tractatus Theologico-Politicus in 1670 made Spinoza notorious. Although his name did not appear on the work, he was quickly known as its author. The Tractatus was one of the few books to be officially banned in the Netherlands during…

  • Tractatus VII (work by Mariana)

    Juan de Mariana: His Tractatus VII (1609), a series of seven treatises on political and moral subjects, including a defense of the heretic Arias Montano, was published in Cologne but banned by the Inquisition, and Mariana was imprisoned for a year and forced to do penance. Although he remained…

  • traction (medicine)

    Avicenna: Influence in medicine: …the use of pressure and traction to straighten or otherwise correct bone and joint deformities such as curvature of the spine. The techniques were not used again until French surgeon Jean-Fran?ois Calot reintroduced the practice in 1896. Avicenna’s suggestion of wine as a wound dressing was commonly employed in medieval…

  • traction (transport)

    railroad: Advances in traction systems: Diesel-electric locomotives appeared in the 1920s. Individual locomotive units provided up to 5,000 horsepower, a figure equal to all the steam-engine power in the United States in 1800. Locomotive units could be multicoupled and operated by a single engineer. It became routine to…

  • traction battery

    battery: Lead-acid batteries: Traction batteries are employed in industrial lift trucks, delivery trucks, and other vehicles. While some are readily portable, others may weigh several tons. The great weight often serves to stabilize the vehicle during operation. Stationary batteries are now much more common than was once the…

  • traction drive

    transmission: …rolling-contact bodies are known as traction drives. In these transmissions, power is transmitted in a variety of ways that depend on the rolling friction of bodies in the form of cylinders, cones, balls, rollers, and disks.

  • traction headache

    nervous system disease: Headache: …of the head called a traction headache. Traction headaches may be caused by brain swelling, infection, bleeding, tumour, stress, or obstructed flow of cerebrospinal fluid. Also, pain may be felt in the head region although the disorder causing the pain is situated elsewhere; an example is the facial pain sometimes…

  • traction-drive system (hoist)

    stagecraft: Flying systems: In the traction-drive system, the hoisting line–counterweight system is not directly coupled to the electric motor drive, and slippage may occur during acceleration and deceleration of the payload, according to velocity and the weight of the payload. Consequently, traction-drive hoists are utilized only when a relatively constant…

  • tractor (vehicle)

    Tractor, high-power, low-speed traction vehicle and power unit mechanically similar to an automobile or truck but designed for use off the road. The two main types are wheeled, which is the earliest form, and continuous track. Tractors are used in agriculture, construction, road building, etc., in

  • tractor (truck unit)

    truck: Types and definitions: A truck tractor is a motor vehicle designed primarily for drawing truck trailers and constructed to carry part of the weight and load of a semitrailer, which is a truck trailer equipped with one or more axles and constructed so that the end and a substantial part…

  • tractor loader (engineering)

    Tractor loader, tractor carrying a front-mounted bucket that can be raised, lowered, and tilted forward and backward hydraulically. It is forced into the digging by forward motion of the tractor and retracted and swung by backing and steering the tractor. Tractor loaders are used primarily for

  • tractotomy (surgical procedure)

    human sensory reception: Nerve function: …in surgical procedures (such as tractotomy) in which spinal tracts or parts of the nerves leading into the brainstem are selectively cut. Such operations are designed specifically to relieve pain without unduly diminishing pressure sensitivity.

  • Tracts for the Times (British religious publication)

    John Keble: …of the Oxford Movement’s 90 Tracts for the Times, which were intended to rouse the Anglican clergy against the theory of a state-controlled church and which caused the movement’s advocates to be known as Tractarians. The Tractarians encouraged study of the early Church Fathers, edited their works, and arranged for…

  • Tracy (sheep)

    pharming: …pharming was a sheep named Tracy, born in 1990 and created by scientists led by British developmental biologist Ian Wilmut at Roslin Institute in Scotland. Tracy was created from a zygote (a single-celled fertilized embryo) genetically engineered through DNA injection to produce milk containing large quantities of the human enzyme…

  • Tracy, Alexandre de Prouville, marquis de (French military commander)

    New France: …King sent a military commander, Alexandre de Prouville, the marquis de Tracy, and a regiment of soldiers who in 1666 defeated the Iroquois and forced them to make peace. It was then possible to proceed to populate and develop New France. More than 3,000 settlers, including girls of marriageable age,…

  • Tracy, Benjamin F. (United States naval secretary)

    Benjamin F. Tracy, U.S. secretary of the Navy (1889–93) who played a major role in the rebuilding and modernization of the U.S. fleet. Tracy began his career as a lawyer; he was admitted to the bar in 1851 and served as district attorney of Tioga County, N.Y., from 1853 to 1859. A founder of the

  • Tracy, Benjamin Franklin (United States naval secretary)

    Benjamin F. Tracy, U.S. secretary of the Navy (1889–93) who played a major role in the rebuilding and modernization of the U.S. fleet. Tracy began his career as a lawyer; he was admitted to the bar in 1851 and served as district attorney of Tioga County, N.Y., from 1853 to 1859. A founder of the

  • Tracy, Spencer (American actor)

    Spencer Tracy, rough-hewn American film star who was one of Hollywood’s greatest male leads and the first actor to receive two consecutive Academy Awards for best actor. As a youth Tracy was bored by schoolwork and joined the U.S. Navy at age 17. Despite his distaste for academics, he eventually

  • Tracy, Spencer Bonaventure (American actor)

    Spencer Tracy, rough-hewn American film star who was one of Hollywood’s greatest male leads and the first actor to receive two consecutive Academy Awards for best actor. As a youth Tracy was bored by schoolwork and joined the U.S. Navy at age 17. Despite his distaste for academics, he eventually

  • tradable-allowance scheme (law)

    environmental law: Economic incentives: By the 1990s, “tradable allowance schemes”, which permit companies to buy and sell “pollution credits,” or legal rights to produce specified amounts of pollution, had been implemented in the United States. The most comprehensive and complex such program, created as part of the 1990 Clean Air Act, was…

  • trade (economics)

    anti-Semitism: Anti-Semitism in medieval Europe: …some Jews became prominent in trade, banking, and moneylending, and Jews’ economic and cultural successes tended to arouse the envy of the populace. This economic resentment, allied with traditional religious prejudice, prompted the forced expulsion of Jews from several countries and regions, including England (1290), France (14th century), Germany (1350s),…

  • trade acceptance (finance)

    Acceptance, short-term credit instrument consisting of a written order requiring a buyer to pay a specified sum at a given date to the seller, signed by the buyer as an indication of his intention to honour his obligation. Acceptances are used in financing export and import operations and in some

  • Trade Act (United States [2002])

    Robert B. Zoellick: …getting congressional approval of the Trade Act of 2002, restoring so-called fast-track authority to the president. In 2005–06 he was deputy secretary of state, dealing particularly with China and Sudan. After leaving the administration in June 2006, Zoellick became a vice-chairman of the investment bank Goldman Sachs.

  • trade agreement

    Trade agreement, any contractual arrangement between states concerning their trade relationships. Trade agreements may be bilateral or multilateral—that is, between two states or more than two states. For most countries international trade is regulated by unilateral barriers of several types,

  • Trade and Development Board

    United Nations Conference on Trade and Development: The Trade and Development Board, UNCTAD’s executive body, is responsible for the operations of the organization when the Conference is not in session.

  • Trade and Markets in the Early Empires (work by Polanyi)

    Karl Polanyi: The second volume, Trade and Markets in the Early Empires (1957, written with others), concentrated on nonmarket forms of society. Polanyi developed a conceptual framework for what he regarded as nonmarket economies. His final work, published posthumously, was Dahomey and the Slave Trade (1966), which analyzed the economic…

  • Trade and Welfare (work by Meade)

    James Edward Meade: …Balance of Payments (1951) and Trade and Welfare (1955). In the first of these books he sought to synthesize Keynesian and neoclassical elements in a model designed to show the effects of various monetary and fiscal policies on the balance of payments. In the second volume Meade explored the effects…

  • trade association (business)

    Trade association, voluntary association of business firms organized on a geographic or industrial basis to promote and develop commercial and industrial opportunities within its sphere of operation, to voice publicly the views of members on matters of common interest, or in some cases to exercise

  • trade balance

    Balance of trade, the difference in value over a period of time between a country’s imports and exports of goods and services, usually expressed in the unit of currency of a particular country or economic union (e.g., dollars for the United States, pounds sterling for the United Kingdom, or euros

  • trade barrier (international trade)

    economic development: The role of the international economy: Removal of the trade barriers that developed countries have erected against developing countries is at least as important as economic aid. Trade barriers are many. They include restrictions on temperate-zone agricultural products and sugar; restrictions on the simpler labour-intensive manufactured goods (which often can be produced more cheaply…

  • trade bead (barter system)

    South Africa: First urban centres: The trade beads they offered in return began to reach villages in the interior, the first indications that the more complex economic and social structures associated with long-distance trade were developing. The arid Limpopo River valley, avoided by the earliest farmers, developed as a trade route.…

  • trade credit (finance)

    Trade credit, deferment of payment for goods or services purchased by one company from another, granted by the seller for a short period, primarily to give the buyer a means of financing inventories. This type of credit (known as open-book account credit), recorded by the seller as accounts

  • Trade Disputes Act (United Kingdom [1906])

    Trade Disputes Act, (1906), British legislation that provided trade unions with immunity from liability for damages arising from strike actions. The background to the statute was a series of adverse court decisions affecting the capacity of trade unions to strike, culminating in the Taff Vale

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