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Bible Dictionaries
Photochronograph

Webster's Dictionary

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Photochronography
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(1):

(n.) An instrument for the photographic recording of star transits.

(2):

(n.) 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.

Bibliography Information
Webster, Noah. Entry for 'Photochronograph'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​p/photochronograph.html. 1828.
 
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