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1 definition found
 for Pho`to*chron`o*graph
From The Collaborative International Dictionary of English v.0.48 :

  Photochronograph \Pho`to*chron"o*graph\, n. [Photo- +
     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.]

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