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tractor

tractor, in agriculture, vehicle used to pull such equipment as plows, cultivators, and mowers; to power stationary devices such as saws and winches; and to push snowplows and earth-moving implements. Early tractors were steam-driven; now they are generally powered by gasoline or diesel engines. The two main types are wheeled tractors and crawlers, or caterpillars, which move on treads. Advances in technology resulted in the number of tractors in the United States increasing from 600 in 1907 to 3.4 million by 1950. The power takeoff, which transmitted power from the tractor engine to an implement via a shaft, was introduced in 1918. The small general-purpose tractor followed c.1924. Pneumatic rubber tires, affording increased speed, easier operation, lower fuel consumption, and longer wear, were introduced in 1932. Four-wheel drive and diesel power increased pulling power in the 1950s and 60s. These advances led to today's very large, double-tired tractors with enclosed, air-conditioned cabs, capable of pulling several gangs of plows.

See R. Leffingwell, The American Farm Tractor (1991).

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tractor

tractor A device for moving continuous stationery through a printer and maintaining good registration relative to the page boundaries. The technique by which this is achieved is known as tractor feed. The tractors are used in pairs and consist of loops of light chain or bands on which are mounted pegs (also known as pintles or sprockets) that engage with holes that have been punched along both edges of the stationery. The tractors are usually driven by a d.c. servo or stepper motor that is controlled by the printer electronics. In high-speed printers there may be pairs of tractors above and below the print line but in lower-speed devices there is usually only one pair and friction is relied upon to keep the paper tensioned. In printers for transaction documents the tractors are arranged immediately below the print line so that the document may be torn off close to the last line of print.

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tractor

tractor Four-wheeled or tracked vehicle for moving and operating heavy implements. Tractors are used mostly in farming and construction. The first tractors were built in the 1870s. Modern tractors have petrol or diesel engines, and can haul and power a wide range of implements, including hay balers, crop sprayers, and mowing machines.

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tractor

trac·tor / ˈtraktər/ • n. a powerful motor vehicle with large rear wheels, used chiefly on farms for hauling equipment and trailers. ∎  a short truck consisting of the driver's cab, designed to pull a large trailer.

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tractor

tractorattar, batter, bespatter, chatter, clatter, flatter, hatter, Kenyatta, latter, matamata, matter, natter, patter, platter, ratter, regatta, satyr, scatter, shatter, smatter, spatter, splatter, yatter •abstractor, actor, attractor, compactor, contractor, enactor, exactor, extractor, factor, infractor, protractor, redactor, refractor, tractor, transactor •Atlanta, banter, canter, infanta, levanter, manta, ranter, Santa, tam-o'-shanter •adaptor, captor, chapter, raptor •Antofagasta, aster, Astor, canasta, Jocasta, oleaster, pasta, piastre (US piaster), pilaster, poetaster, Rasta, Zoroasterdragster, gagster •Baxter • prankster • hamster •gangsta, gangster •malefactor • benefactor •pitter-patter • subcontractor •chiropractor

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