Vintage Military Surplus, Vibrating Reed Tachometer, Direct Indicating Pick-up

Description

Vibrating Reed Tachometer
This listing is for “1” military surplus vibrating reed tachometer.
NATO Stock Number:   6680-00-490-2878
Part #:
43d13835
Manufacturer:
WAC Engineering
FSC Application Data:   T.O. 33A1-11-1-101; Direct Indication vibration pick-up assembly, a compact mechanical instrument designed for checking propeller speeds and for performing approximate vibration analysis.
Dimensions: Height 2 INCHES, Width 2”, Depth 6.5”
Speed Indication Accuracy +/- 2%
Consisting of a vibrating reed, the length of which is adjusted by a turning screw.
The reed moves across the face of a calibrated housing plate to give vibration amplitude while the position of the screw holder gives an indication of vibration frequency calibrated in RPMS.
Includes a wooden carrying case.
This unit was purchased my father directly from the military over 40 years ago and has been in dry storage ever since.