mechanical wear
71Electric motor — For other kinds of motors, see motor (disambiguation). For a railroad electric engine, see electric locomotive. Various electric motors. A 9 volt PP3 transistor battery is in the center foreground for size comparison. An electric motor converts… …
72Powered exoskeletons in fiction — Powered armor has appeared in a wide variety of fiction, beginning with E. E. Smith s Lensman series in 1937. Since then, it has featured in science fiction movies and literature, comic books, video games, and tabletop role playing games. One of… …
73Ceramic matrix composite — Fracture surface of a fiber reinforced ceramic composed of SiC fibers and SiC matrix. The fiber pull out mechanism shown is the key to CMC properties …
74Moving parts — This article is about machinery and engineering. For the rock band, see Moving Parts. For the musical album, see Fewer Moving Parts. some of the moving parts of an automobile engine The moving parts of a machine are those parts of it that move.… …
75Bicycle chain — This article is about the drive chain on a bicycle. For bicycle chain locks, see Bicycle lock. Bicycle chains Roller chain and …
76Bicycle brake systems — are used to slow down, or brake a bicycle. There have been various types through history, and several are still in use today.HistoryEarly bicycles such as the high wheeled penny farthing bikes were fitted with spoon brakes. As they were fixed… …
77materials science — the study of the characteristics and uses of various materials, as glass, plastics, and metals. [1960 65] * * * Study of the properties of solid materials and how those properties are determined by the material s composition and structure, both… …
78Watch — 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 …
79Type metal — The term type metal (sometimes called hot metal ) represents a range of metal alloys that are used in traditional typefounding and mechanical typesetting. History Although the knowledge of casting soft metals in moulds was well established before …
80Verge escapement — showing (c) crown wheel, (v) verge, (p,q) pallets Ve …
