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Photochronograph

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Definitions of Photochronograph
Pronunciation : Pho`to*chron"o*graph
Part of Speech : n.
Definition : 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.

[Photo-+ chronograph.]
Source : Webster's Unabridged Dictionary, 1913

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