(now NIST)

См. также в других словарях:

• cos|mog|o|nist — «koz MOG uh nihst», noun. an expert in or student of cosmogony: »By now we cosmogonists are ready to admit that our earth is an insignificant part of the universe (Atlantic) …   Useful english dictionary

• Atomic clock — Nuclear clock redirects here. For the clock as a measure for risk of catastrophic destruction, see Doomsday Clock. For a clock updated by radio signals (commonly but inaccurately called an atomic clock ), see Radio clock. For the album by Zion I …   Wikipedia

• History 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… …   Wikipedia

• Pendulum clock — A pendulum clock is a clock that uses a pendulum, a swinging weight, as its timekeeping element. From its invention in 1656 by Christiaan Huygens until the 1930s, the pendulum clock was the world s most accurate timekeeper, accounting for its… …   Wikipedia

• History of cryptography — The history of cryptography begins thousands of years ago. Until recent decades, it has been the story of what might be called classic cryptography that is, of methods of encryption that use pen and paper, or perhaps simple mechanical aids. In… …   Wikipedia

• Fortran — Infobox programming language name = Fortran caption = The Fortran Automatic Coding System for the IBM 704 (October 15, 1956), the first Programmer s Reference Manual for Fortran paradigm = multi paradigm: procedural, imperative, structured,… …   Wikipedia

• Riefler escapement — The Riefler escapement is a mechanical escapement for precision pendulum clocks invented and patented [German patent no. 50,739] by Sigmund Riefler in 1889. [cite book last = first = authorlink = coauthors = title = Special Catalog of the Joint… …   Wikipedia

• Quartz clock — A quartz clock is a clock that uses an electronic oscillator that is regulated by a quartz crystal to keep time. This crystal oscillator creates a signal with very precise frequency, so that quartz clocks are at least an order of magnitude more… …   Wikipedia

• Jane Barbe — (birth date|1928|07|29 mdash;Dda|2003|07|18|1928|07|29) was an American voice actress known as the “Time Lady” [Koppel, Ted. “Nightline.” [http://www.youtube.com/watch?v=KAjb DpBBhM# Voice Mail Jail] . ABC News, 1996. News Program. American… …   Wikipedia

• Triple point — In thermodynamics, the triple point of a substance is the temperature and pressure at which three phases (for example, gas, liquid, and solid) of that substance coexist in thermodynamic equilibrium.GoldBookRef | title=Triple point |file=T06502… …   Wikipedia

• Knoop hardness test — The Knoop hardness test is a microhardness test a test for mechanical hardness used particularly for very brittle materials or thin sheets, where only a small indentation may be made for testing purposes. A pyramidal diamond point is pressed into …   Wikipedia