Electrically controlled chronometer which is capable of directly indicating time intervals with accuracy of one-thousandth of second; it is driven by powerful phonic motor, which is controlled by tuning fork of adjustable frequency; used for measurement of time in physical investigations, sound ranging, depth sounding and in hydrographical survey, psychological measurements, automobile speed events, and electrical investigations.
The phonic chronometer
Jl. Sci. Instruments
Journal of Scientific Instruments ; 1 , n 6
1924
13 pages
6 Figs.
Article (Journal)
Electronic Resource
English
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