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Talking alarm clock: Only a few IC's are needed to build a clock that really tells time. Lee Glinski: 54/5: May 1983 Car burglar alarm: An inexpensive form of insurance that can avert an automobile break-in. Edward W. Loxterkamp: 54/5: May 1983 VLF-HF passive antenna tuner: Another approach to optimizing reception at very-low frequencies. R. W ...
Counting timers used in modern computers provide similar features at lower precision, and may trace their requirements to this type of clock. (e.g. in the PDP-8, the mains-based clock, model DK8EA, came first, and was later followed by a crystal-based clock, DK8EC.) A software-based clock must be set each time its computer is turned on.
Real-time simulation refers to a computer model of a physical system that can execute at the same rate as actual "wall clock" time. In other words, the computer model runs at the same rate as the actual physical system.
A tide dial, also known as a mass dial [2] or a scratch dial, [3] [4] is a sundial marked with the canonical hours rather than or in addition to the standard hours of daylight. Such sundials were particularly common between the 7th and 14th centuries in Europe , at which point they began to be replaced by mechanical clocks .
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The clock will be almost entirely underground, and only accessed by foot traffic from the east once complete. Before building the public clock in Nevada, the foundation is building a full-scale clock of similar design in a mountain of the Sierra Diablo range near Van Horn, Texas. The test drilling for the underground construction at this site ...
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Standard-quality 32 768 Hz resonators of this type are warranted to have a long-term accuracy of about six parts per million (0.0006%) at 31 °C (87.8 °F): that is, a typical quartz clock or wristwatch will gain or lose 15 seconds per 30 days (within a normal temperature range of 5 to 35 °C or 41 to 95 °F) or less than a half second clock ...