machine wear mechanism
41Typewriter — Mechanical desktop typewriters, such as this Underwood Five, were long time standards of government agencies, newsrooms, and offices …
42Drill bit — For the fictional character, see Drill Bit (Transformers). For the cancelled skyscraper nicknamed Drill bit, see Chicago Spire. For the types used in drilling wells, see Well drilling. From top to bottom: Spade, lip and spur (brad point), masonry …
43India — /in dee euh/, n. 1. Hindi, Bharat. a republic in S Asia: a union comprising 25 states and 7 union territories; formerly a British colony; gained independence Aug. 15, 1947; became a republic within the Commonwealth of Nations Jan. 26, 1950.… …
44Fountain pen — A fountain pen is a nib pen that, unlike its predecessor the dip pen, contains an internal reservoir of water based liquid ink. From the reservoir, the ink is drawn through a feed to the nib and then to the paper via a combination of gravity and… …
45Moving 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.… …
46Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… …
47Laserdisc — Not to be confused with disk laser, a flat configuration solid state laser. Not to be confused with VCD, DVD, or Blu ray, optical disc formats employing digital video encoding. Not to be confused with CED, a coincident but incompatible analogue… …
48MythBusters (2010 season) — Country of origin Australia United States No. of episodes 25 (includes 4 specials) Broadcast Original channel …
49Watch — 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 …
50Railroad switch — For other uses, see Switch (disambiguation). A right hand railroad switch with point indicator pointing to right …
