Category:Photochronograph

Pho`to*chron"o*graph, n. [photo-+ chronograph.]

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.