Photochronograph

Definition of Photochronograph

Pho`to`chron´o`graph
n.1.(Physics) An instrument for recording minute intervals of time. The record is made by the power of a magnetic field, due to an electric signaling current, to turn the plane of polarization of light. A flash, coinciding in time and duration with the signal, is thus produced and is photographed on a moving plate.
2.(Astron.) An instrument for the photographic recording of star transits.
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Photo-electric cell
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