STROBOSCOPIC GRAMOPHONE SPEED INDICATOR.
in response to requests We are reprintmsg this speed maicator ird0m tne 1900 Guide, Cul Out the dise and mount it on on the gramophone turntable and set the motor revolving. When under electric light the bars should appear stationary. Adjust the speed regulator till this is so.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310424.2.50
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Radio Record, Volume IV, Issue 41, 24 April 1931, Page 17
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52STROBOSCOPIC GRAMOPHONE SPEED INDICATOR. Radio Record, Volume IV, Issue 41, 24 April 1931, Page 17
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