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In fully automatic time, both starting and stopping are triggered automatically, by sensors. The timing functions are traditionally controlled by two buttons on the case. Pressing the top button starts the timer running, and pressing the button a second time stops it, leaving the elapsed time displayed.
A time switch (also called a timer switch, or simply timer) is a device that operates an electric switch controlled by a timer. Intermatic introduced its first time switch in 1945, which was used for "electric signs, store window lighting, apartment hall lights, stokers, and oil and gas burners." A consumer version was added in 1952.
The other was provided with a motion picture camera which photographed the runner at the tape and the dial of the time indicator simultaneously." [7] Kirby's system was also used at the 1932 US. Olympic Trials, where Ralph Metcalfe's winning time of 10.62 in the 100 meters is considered possibly the first automatically timed world record. [8]
An example of a simple timer is an hourglass. Commonly, a timer triggers an alarm when it ends. A timer can be implemented through hardware or software. Stopwatches operate in the opposite direction, upwards from 00:00, measuring elapsed time since a given time instant. Time switches are timers that control an electric switch.
In 1972, Signetics originally released the 555 timer in DIP-8 and TO5-8 metal can packages, and the 556 timer was released in a DIP-14 package. [ 4 ] In 2006, the dual 556 timer was available in through-hole packages as DIP-14 (2.54 mm pitch), [ 21 ] and surface-mount packages as SO-14 (1.27 mm pitch) and SSOP-14 (0.65 mm pitch).
At approximately the same time, Haydon formed a new company named "Haydon Switch, Inc." to produce and distribute precision devices called the miniature snap-action switch which he had invented typified by patents granted as "Snap Action Switch" US Patent #2,700,079; [7] US Patent #2,773,954; [8] US Patent # 2,773,955.
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