rate of a chronometer
11Rating — Rate Rate, v. t. [imp. & p. p. {Rated}; p. pr. & vb. n. {Rating}.] 1. To set a certain estimate on; to value at a certain price or degree. [1913 Webster] To rate a man by the nature of his companions is a rule frequent indeed, but not infallible …
12COSC — This article is about the Swiss Official Chronometer Testing Institute, known by its French acronym of COSC. For the state college in Connecticut, see Charter Oak State College. Contrôle Officiel Suisse des Chronomètres COSC aka C.O.S.C. is… …
13ETA SA — Infobox Company company name = ETA SA company type = Member of the Swatch Group company company slogan = Elegance, Technology, Accuracy foundation = 1856 (1793, 1896) location city = Grenchen location country = Switzerland key people = industry …
14Balance wheel — in a cheap 1950s alarm clock, the Apollo, by Lux Mfg. Co. showing the balance spring (1) and regulator (2) …
15History of timekeeping devices — For thousands of years, devices have been used to measure and keep track of time. The current sexagesimal system of time measurement dates to approximately 2000 BC, in Sumer. The Ancient Egyptians divided the day into two 12 hour periods, and… …
16Clock — For other uses, see Clock (disambiguation). Timepiece redirects here. For the Kenny Rogers album, see Timepiece (album). Platform clock at King s Cross railway station, London …
17Radiometric dating — (often called radioactive dating) is a technique used to date materials such as rocks, usually based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates.[1]… …
18Balance spring — A balance spring, or hairspring, is a fine spiral or helical spring used in mechanical watches, marine chronometers, and other timekeeping mechanisms to control the rate of vibration of the balance wheel. A balance spring usually has a regulator… …
19geochronology — geochronologic /jee oh kron l oj ik/, geochronological, adj. geochronologist, n. /jee oh kreuh nol euh jee/, n. the chronology of the earth, as based on both absolute and relative methods of age determination. [1890 95; GEO + CHRONOLOGY] * * *… …
20navigation — navigational, adj. /nav i gay sheuhn/, n. 1. the act or process of navigating. 2. the art or science of plotting, ascertaining, or directing the course of a ship, aircraft, or guided missile. [1520 30; < L navigation (s. of navigatio) a voyage.… …
