spring tension
31Switch — For other uses, see Switch (disambiguation). Electrical switches. Top, left to right: circuit breaker, mercury switch, wafer switch, DIP switch, surface mount switch, reed switch. Bottom, left to right: wall switch (U.S. style), miniature toggle… …
32Pencil detonator — Introduced during World War II, a pencil detonator or time pencil is a chemically activated time fuze designed to be connected to a detonator or short length of safety fuse. Pencil detonators are so called because they have approximately the same …
33Semi-automatic rifle — US M1941 is a semi automatic rifle A semi automatic rifle is a type of rifle that fires a single bullet each time the trigger is pulled, automatically ejects the spent cartridge, chambers a fresh cartridge from its magazine, and is immediately… …
34Clutch — For other uses, see Clutch (disambiguation). Rear side of a Ford V6 engine, looking at the clutch housing on the flywheel …
35Switchblade — A switchblade (also known as automatic knife, switch, or in British English flick knife) is a type of knife with a folding or sliding blade contained in the handle which is opened by a spring when a button or lever on the grip is… …
36Remontoire — In mechanical horology, a remontoire, (from the French remonter , meaning to wind ) is a small secondary source of power, a weight or spring, which runs the timekeeping mechanism and is itself periodically rewound by the timepiece s main power… …
37Watch — For other uses, see Watch (disambiguation). Early wrist watch by Waltham, worn by soldiers in World War I (Deutsches Uhrenmuseum, Inv. 47 3352) A watch is a small timepiece, typically worn either on the wrist or attached on a chain and carried in …
38Marine chronometer — Breguet twin barrel box chronometer. Classification Clock Industry Transportation …
39Seat belt — This article is about the safety device. For the band, see The Seatbelts. A 3 point seat belt …
40Ortgies Semi-Automatic Pistol — Ortgies 7.65 mm semi automatic pistol with grip safety engaged Type Semi automatic pistol Place of origin …
