rig machinery
81Mercury swivel commutator — A mercury swivel commutator is an electrical commutator typically used in electrophysiological experiments on head free or moving animals. Electrical recordings from stationary, head fixed animals can be done with electrodes attached to a… …
82Water well — Village pump redirects here. For information on Wikipedia project related discussions see Wikipedia:Village pump. Water well at the Wald monastery in Germany. A water well is an excavation or structure created in the ground by digging, driving,… …
83HMS Avenger (1845) — HMS Avenger was a wooden paddle wheel frigate of the Royal Navy launched in 1845 and wrecked with heavy loss of life in 1847.Construction and commissioning Avenger was built to a design by Sir William Symonds, approved on 25 March 1844. She was… …
84Navratri — For the Indian film, see Navarathri (1966 film). Navaratri Navratri Golu depicting various forms of Hindu deities worshiped for 9 days Type Major [Hindu] Festival …
85Bolivia — Bolivian, adj., n. /beuh liv ee euh, boh /; Sp. /baw lee vyah/, n. 1. a republic in W South America. 7,669,868; 404,388 sq. mi. (1,047,370 sq. km). Caps.: La Paz and Sucre. 2. (often l.c.) a twill fabric made of cut pile with lines either in the… …
86Ethiopia — /ee thee oh pee euh/, n. 1. Formerly, Abyssinia. a republic in E Africa: formerly a monarchy. 58,732,577; 409,266 sq. mi. (1,060,000 sq. km). Present boundaries include Eritrea. Cap.: Addis Ababa. 2. Also called Abyssinia. an ancient region in NE …
87gear — gearless, adj. /gear/, n. 1. Mach. a. a part, as a disk, wheel, or section of a shaft, having cut teeth of such form, size, and spacing that they mesh with teeth in another part to transmit or receive force and motion. b. an assembly of such… …
88Guyana — Guyanese /guy euh neez , nees /, n., adj. /guy an euh, ah neuh/, n. an independent republic on the NE coast of South America: a former British protectorate; gained independence 1966; member of the Commonwealth of Nations. 706,116; 82,978 sq. mi.… …
89United Arab Emirates — an independent federation in E Arabia, formed in 1971, now comprising seven emirates on the S coast (formerly, Pirate Coast or Trucial Coast) of the Persian Gulf, formerly under British protection: Abu Dhabi, Dubai, Sharjah, Ajman, Umm al Qaiwain …
90Vietnam — /vee et nahm , nam , vyet , vee it /, n. 1. Official name, Socialist Republic of Vietnam. a country in SE Asia, comprising the former states of Annam, Tonkin, and Cochin China: formerly part of French Indochina; divided into North Vietnam and… …
