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BBC EP14/1 Audio Test Set

1972

Record frequency meter

Frequency meter made by Nalder

Campbell vibrating reed frequency meter, 1896

1896

Frequency Meter BC-221-M

1944

Electrical frequency meter

circa 1900

Ferranti Frequency Meter

1940-1960

Ferranti electric frequency meter

Ferranti frequency meter

Frequency meter. German.

Portable vibrating-speed frequency meter by Elliott

Reed frequency meter, 26 to 74 cycles per second

Frequency meter

1960-1969

Frequency meter

One German Frequency Meter Type WIK, 30-375 Mc/s.

Frahm resonant reed frequency meter, model 4957

frequency meter

circa 1891

Ferranti frequency meter

Ferranti frequency meter

Resonant reed frequency meter for measuring alternating voltages in the range 45 to 55 Hz using a supply of 200-250V made by James G. Biddle Co. USA

Resonant reed frequency meter

1965-1979
frequency meter; parts are attached to a wooden base, with reader separated in a cased section. manufacturer unknown

Frequency meter

Frequency meter, vibration galvanometer made by Siemens Brothers & Co. Ltd, England, 1987

Frequency meter by Siemens

1897
Model 214 frequency meter 60 cycles, 110 volts Instrument no. 588 with reactance, Weston Electrical Instrument Co., Newark, New Jersey, United States

Model 214 frequency meter 60 cycles

Frequency meter; large wood framed meter with glass front, and three dail faces. This allows for the meter and mechanism to be seen easily. Also has a white wire starting from the back, and is wrapped around base. Manufactured by Everett Edgcumbe, London.

Frequency Meter