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A Brief History of Telegraphy

A Brief History of Telegraphy

A Short History of the Galvanometer

A Short History of the Galvanometer


Image of G.P.O. No83 GALVANOMETER IN LEATHER CASE, 1930's

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G.P.O. No83 GALVANOMETER IN LEATHER CASE, 1930's

GPO engineers Tangent Galvanometer in leather case Type No 83 maker unknown.

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A1527

Image of SILVERTOWN TELEGRAPH WORKS GALVANOMETER, 1930's

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SILVERTOWN TELEGRAPH WORKS GALVANOMETER, 1930's

Used to detect current in either direction in Telegraph circuits on receiving or sending stations. Also used as test equipment and known as a differential type. Made at the Telegraph Works Silvertown.

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A1469

Image of 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

Image of POST OFFICE GALVANOMETER GPO 41, 1930's

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POST OFFICE GALVANOMETER GPO 41, 1930's

Used for indication of signal direction ( Current ) in telegraphy systems also as a test instrument.

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A0241

Image of EDISWAN GALVANOMETER, 1930's

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EDISWAN GALVANOMETER, 1930's

Used to detect current in either direction in telegraphy systems.
Also as test equipment.

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A0240

Image of SILVERTOWN GALVANOMETER, 1916

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SILVERTOWN GALVANOMETER, 1916

Used as either a piece of test equipment or to send or receive Morse.
The needle could deflect either left or right dependent on the direction of the current,or could measure the strength of the current by the deflection measured in degrees.

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A0328


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