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Time clock. A time clock, sometimes known as a clock card machine, punch clock, or time recorder, is a device that records start and end times for hourly employees (or those on flexi-time) at a place of business. In mechanical time clocks, this was accomplished by inserting a heavy paper card, called a time card, into a slot on the time clock.
Hand-powered electrical equipment, such as a clockwork radio, where an energy-storing spring accounting for much of the size and weight of the device rotates a much smaller electric generator; such equipment is very popular where batteries and mains power (house current) are scarce. Movement of a grandfather clock with striking mechanism.
The Shortt–Synchronome clock, an electrical driven pendulum clock designed in 1921, was the first clock to be a more accurate timekeeper than the Earth itself. [167] A succession of innovations and discoveries led to the invention of the modern quartz timer. The vacuum tube oscillator was invented in 1912. [168]
1676 - Daniel Quare, a London clock-maker, invents the repeating clock, that chimes the number of hours (or even minutes). [7] 1680 - Second hand introduced. 1737 - John Harrison presents the first stable marine chronometer, thereby allowing for precise longitude determination while at sea. 1850 - Aaron Lufkin Dennison starts in Roxbury, Mass.U ...
Time and attendance. Time and attendance systems ( T&A) are used to track and monitor when employees start and stop work. A time and attendance system enables an employer to monitor their employees working hours and late arrivals, early departures, time taken on breaks and absenteeism. [1] It also helps to control labor costs by reducing over ...
A pendulum clock is a clock that uses a pendulum, a swinging weight, as its timekeeping element. The advantage of a pendulum for timekeeping is that it is an approximate harmonic oscillator: It swings back and forth in a precise time interval dependent on its length, and resists swinging at other rates. From its invention in 1656 by Christiaan ...
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