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Silverton Telegraph works Galvanometer. 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. The instrument was used to detect the existence of small electrical currents and determining their strength. Please see condition, piece of wood is off at the bottom left side. Dimensions: height 18.4cm x width 13.9cm x 7cm. Shipping: R60.00