Frequency meter, 40 to 60 cycles per second, 410 volts, made in England by G.E.C., patent No.648569, in wooden case (handle missing, clip of cover broken off), pointer type with crossed-coil movement, the frequency dependence beng produced by an inductance in series with one coil
- Electricity and Magnetism
- Object Number:
- European Space Tribology Laboratory
- Permanent collection
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