Portable vibrating-speed frequency meter by Elliott

Portable vibrating-speed frequency meter by Elliot

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Portable vibrating-speed frequency meter by Elliot
Science Museum Group
© The Board of Trustees of the Science Museum

Portable vibrating-speed frequency meter by Elliott, no.2443, range 44 to 56 cycles per second

Details

Category:
Electricity Supply
Object Number:
1980-60
type:
frequency meter
credit:
Park, A.J.