n. [ Gr. &unr_; time + -graph: cf. F. chronographe. ] 1. An instrument for measuring or recording intervals of time, upon a revolving drum or strip of paper moved by clockwork. The action of the stylus or pen is controlled by electricity. [ 1913 Webster ]
n. (Astron. Physics) An instrument for obtaining an accurate record of the time at which any observed phenomenon occurs, or of its duration. It has an electro-magnetic register connected with a clock. See Chronograph. [ 1913 Webster ]
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. [ Webster 1913 Suppl. ]
2. (Astron.) An instrument for the photographic recording of star transits. [ Webster 1913 Suppl. ]
n. Art of recording or measuring intervals of time by the photochronograph. -- Pho`to*chron`o*graph"ic-graph"ic*al a. -- Pho`to*chron`o*graph"ic*al*ly, adv. [Webster 1913 Suppl.]
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