Differential Galvanometer

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“The galvanometer consists of two distinct coils of wire, each having the same resistance, and having equal magnetic effects upon the needle. These coils C and C’ are wound in opposite directions, as shown, and one end of each is joined to the same terminal on the frame of the galvanometer; the other ends are joined to separate terminals also situated on the frame.” (Britannica, 1891)

Source

Benson John Lossing, ed. The New Popular Educator (London, England: Cassell & Company Limited, 1891)

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