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A simple 24-hour cyclical electromechanical time switch with a French CEE 7/5 socket. 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 ...
Automatic enlarger timer "Switch and exposure meter for B/W and color negatives and slides. Selective or integral exposure measurement using an independent metering head with a silicon optical sensor and converging lens. Three digits, display amber digital. Start button preparation screen. Time step in the time cycle with countdown to zero.
The first known time with an auto timing device in the Olympic Games was in the steeplechase in 1928, won by Toivo Loukola in 9:21.60 (9:21 4/5 official hand time). The device used was the Löbner camera-timer.
The first automatic timer, the dashpot timer has been used in many different machines and has many variations. Pneumatic, hydraulic-action, and mercury displacement timers. Being used in a variety of things such as printing presses , motors , and even irrigation systems , the dashpot timer has seen many applications.
Using feedback and external time delay and other sensory circuits, it is possible to build an electromechanical state machine using a cam timer. These are common in washing machines , where the cam timer runs in phases, but also stops and waits for external signals such as a fill level sensor, or a water heating temperature sensor.
Timer 0 is used by Microsoft Windows (uniprocessor) and Linux as a system timer, timer 1 was historically used for dynamic random access memory refreshes and timer 2 for the PC speaker. [ 2 ] The LAPIC in newer Intel systems offers a higher-resolution (one microsecond) timer. [ 3 ]