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• Crank (mechanism) — A crank is an arm attached at right angles to a rotating shaft by which reciprocating motion is imparted to or received from the shaft. It is used to change circular into reciprocating motion, or reciprocating into circular motion. The arm may be …   Wikipedia

• Crank: High Voltage — Theatrical release poster Directed by Neveldine/Taylor Produced by …   Wikipedia

• slider-crank mechanism — ▪ mechanics  arrangement of mechanical parts designed to convert straight line motion to rotary motion, as in a reciprocating piston engine, or to convert rotary motion to straight line motion, as in a reciprocating piston pump. The basic nature… …   Universalium

• Walschaerts valve gear — The Walschaerts valve gear is a type of steam engine valve gear invented by Belgian railway mechanical engineer Egide Walschaerts in 1844. The gear is sometimes named without the final s , since it was incorrectly patented under that name. It was …   Wikipedia

• Baker valve gear — was the main competitor to Walschaerts valve gear for steam locomotives in the United States. Strictly speaking it was not a valve gear but a variable expansion mechanism adapted to the Walschaerts layout replacing the expansion link and sliding… …   Wikipedia

• Eccentric (mechanism) — An eccentric in mechanical engineering is a circular disk ( eccentric sheave ) solidly fixed to a rotating axle with its centre offset from that of the axle (hence the word eccentric , out of the centre). It is most often employed in steam… …   Wikipedia

• Southern valve gear — was briefly popular on steam locomotives in the United States. It combines elements of the Walschaerts and Baker patterns.HistorySouthern valve gear was devised by locomotive designers on the Southern Railway (US) and used on many locomotives on… …   Wikipedia

• 4-12-2 — A 4 12 2, in the Whyte notation for the classification of steam locomotives by wheel arrangement, is a locomotive with four leading wheels, twelve driving wheels (six axles) in a rigid frame, and two trailing wheels. Other equivalent… …   Wikipedia

• Pedersen rifle — The Pedersen Rifle, officially known in final form as the T1E3 rifle, was a United States semi automatic rifle designed by John Pedersen that was made in small numbers for testing by the United States Army during the 1920s as part of a program to …   Wikipedia

• History of the single-lens reflex camera — The history of the single lens reflex camera predates the invention of photography in 1826/27 by one and a half centuries with the use of a reflex mirror in a camera obscura first described in 1676. Such SLR devices were popular as drawing aids… …   Wikipedia

• Robert Wornum — (1780 1852) was a piano maker working in London during the first half of the 19th century. He is best known for introducing small cottage and oblique uprights and an action considered to be the predecessor of the modern upright action [David… …   Wikipedia