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GPO 970  DIFFERENTIAL GALVANOMETER, 1930's

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GPO 970 DIFFERENTIAL GALVANOMETER, 1930's

Used to detect current in either direction in telegraph circuits on receiving or sending stations. In Differential mode two coils deflect the needle left or right; if the current through both coils is equal then the needle will remain central.
Also used as a piece of test equipment.

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A0239



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