Definitions from Wiktionary (photochronograph)

▸ noun:  (physics) An instrument for recording very short 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.
▸ noun:  (astronomy) An instrument for the photographic recording of star transits.


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