timer

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timer

(tīm′ĕr)
A device for measuring, signaling, recording, or otherwise indicating elapsed time. Various forms of timers are used in radiographic, surgical, and laboratory work.

timer

the device on the x-ray machine that controls the period of exposure to the beam. It may be a simple clockwork, wind-back timer, or one of two electronic timers which are capable of fast and repeated exposures. Only electronic timers are allowed on modern machines.