Vintage Frahm James G. Biddle Vibrating Reed Tachometer in Wooden Box USA
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From $8.00
Unusual vintage Frahm vibrating-reed tachometer manufactured by the James G. Biddle Co., Philadelphia, USA.
This specialised mechanical instrument was designed for measuring the rotational speed and vibration of machinery using a series of tuned vibrating reeds. The face is graduated in RPM and marked Frahm Tachometer, James G. Biddle Co., Philadelphia, with patent and catalogue numbers.
Presented in its fitted wooden storage box with sliding lid.
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