01 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 cur…
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1.
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.(Physics)
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2.
An instrument for the photographic recording of star transits.(Astron.)