rotatable slide

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Kuhn slide — The Kuhn slide (German: Kuhnsche Schleife ) is part of a modified on steam locomotives and is named after its inventor, Michaal Kuhn (1851 1903). The term is also used to refer to this particular type of Walschaerts valve gear system as a… … Wikipedia
E6B — pilots will still carry and use these Flight Computers. These flight computers are used during flight planning (on the ground before takeoff) to aid in calculating fuel burn, wind correction, time en route, and other items. In the air, the flight … Wikipedia
Caliper — For other uses, see Caliper (disambiguation). A vernier caliper … Wikipedia
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
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
Little Willie — See also: Little Willy Little Willie Little Willie in its later form, with lengthened tracks and without turret at Bovington Type … Wikipedia

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