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spirit level
(Encyclopedia) spirit level, tool for determining whether a surface is horizontal. It consists essentially of a slightly bent transparent tube that is held in a frame. The tube contains some alcohol…Collins, Anthony
(Encyclopedia) Collins, Anthony, 1676–1729, English theologian; a friend of John Locke. He set forth the position of the deists and defended the cause of rational theology. His Discourse of Free…Clyburn, Jim
(Encyclopedia) Clyburn, Jim (James Enos Clyburn), 1940- , African-American politician, b. Sumter, S.C., S.C. State College (B.A.). Clyburn’s father…harmonic motion
(Encyclopedia) CE5 Harmonic motion is exhibited by a weight vibrating on the end of a spring. In A, the displacement of the object from its equilibrium position and the acceleration of the object…loran
(Encyclopedia) loranloranlôrˈănˌ [key], long-range, accurate radio navigational system used by a ship or aircraft to confirm or to determine its geographical position. The term loran is derived from…National Rifle Association of America
(Encyclopedia) National Rifle Association of America (NRA), group founded (1871) to promote shooting, hunting, firearm safety, and wildlife conservation. The NRA has more than 3 million members. The…direction finder
(Encyclopedia) direction finder, electronic device used to determine the position of a ship or aircraft. In a simple direction finder a radio receiver is equipped with a revolving directional antenna…amplitude
(Encyclopedia) amplitudeamplitudeămˈplĭt&oomacr;dˌ [key], in physics, maximum displacement from a zero value or rest position. In the harmonic motion of a pendulum, the amplitude of the swing is…sunstone
(Encyclopedia) sunstone. 1 Crystal mineral thought by some to have been used by the Vikings as an aid to navigation, especially in conditions of low visibility due to clouds or fog when the position…Pomponazzi, Pietro
(Encyclopedia) Pomponazzi, PietroPomponazzi, Pietropyĕˈtrō pōmpōnätˈtsē [key], 1462–1525, Italian philosopher, b. Mantua. He was a professor at Padua, Ferrara, and Bologna. Pomponazzi aroused great…Trending
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