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La Crosse Technology was founded in 1983 as a grandfather clock distribution company after the founder, Allan McCormick, returned from being stationed in Germany. [ 1 ] La Crosse Technology introduced the radio-controlled clock , commonly (but incorrectly) called an "atomic clock" after the extremely accurate timepiece behind the radio signal ...
A projection clock (also called ceiling clock) is an analogue or digital clock equipped with a projector that creates an enlarged image of the clock face or display on any surface usable as a projection screen, most often the ceiling. [1] The clock can be placed almost anywhere if only the projected image must be seen.
A modern LF radio-controlled clock. A radio clock or radio-controlled clock (RCC), and often colloquially (and incorrectly [1]) referred to as an "atomic clock", is a type of quartz clock or watch that is automatically synchronized to a time code transmitted by a radio transmitter connected to a time standard such as an atomic clock.
Commercial rubidium clocks are less accurate than caesium atomic clocks, which serve as primary frequency standards, so a rubidium clock is usually used as a secondary frequency standard. Commercial rubidium frequency standards operate by disciplining a crystal oscillator to the rubidium hyperfine transition of 6.8 GHz (6 834 682 610.904 Hz).
The Lacrosse project began with a United States Marine Corps requirement for a short-range highly accurate guided missile to supplement conventional field artillery. The Navy's Bureau of Ordnance issued contracts to both the Johns Hopkins University Applied Physics Laboratory and the Cornell Aeronautical Laboratory in September 1947, for the study of design aspects pertaining to this mission.
An optical clock is a clock that uses light to track time. It differs from an atomic clock in that it uses visible light, rather than microwaves. [1] [2] Several chemical elements have been studied for possible use in optical clocks. These include aluminum, mercury, strontium, indium, magnesium, calcium, ytterbium, and thorium.
The master atomic clock ensemble at the U.S. Naval Observatory in Washington D.C., which provides the time standard for the U.S. Department of Defense. [1] The rack mounted units in the background are caesium beam clocks. The black units in the foreground are hydrogen maser standards.
Gilbert Atomic Energy Manual — a 60-page instruction book written by Dr. Ralph E. Lapp; Learn How Dagwood Split the Atom — comic book introduction to radioactivity, written with the help of General Leslie Groves (director of the Manhattan Project) and John R. Dunning (a physicist who verified fission of the uranium atom) [11] [12]