Mirror galvanometer used for receiving telegraph signals transmitted through submarine cables.

Such signals were too weak and distorted to drive conventional telegraph receiving equipment. The mirror galvanometer was very sensitive. It indicated the arrival of signal current by rotating a small mirror which deflected a beam of light across a screen for interpretation by the operator.

Made by Elliott Brothers of London, about 1900.

Physical Description

Circular wooden base with central wooden column supporting horizontal brass cylinder with ebonite (?) end plates. Vertical brass rod above cylinder, supporting curved magnet. Brass and steel components. Four brass terminals on wooden base.

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