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Dashpot 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. Even in modern times with electrical and digital timers, these old mechanical timers are still in use due to their simplicity and ability to function in tough environments.
== Types ==
The dashpot timer is a fluid time-on-timer that can be used in definite time motor acceleration starters and controllers. A dashpot timer is a container, a piston, and a shaft. The dashpot timer functions when a magnetic field forces a piston to move within a cylinder when the coil is energized. The movement of the piston is limited by fluid passing through an orifice on the piston. The amount of fluid passing through the orifice is controlled by a throttle value, which determines the delay. If the fluid used to move the piston is air it is actually known as a pneumatic dashpot. If the fluid is oil, it is known as a hydraulic dashpot. Another kind of dashpot timer is the mercury displacement timer, this model uses mercury to contact electrodes.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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