photochronograph
English
[edit]Etymology
[edit]From photo- + chronograph.
Noun
[edit]photochronograph (plural photochronographs)
- (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.
- (astronomy) An instrument for the photographic recording of star transits.