Tangent Galvanometer
A bakelite ring or bobbin is of 165mm diameter with 3 windings of 2, 50, & 500 turns. The magnetometer is supported on a brass tube fitted on an ebonite plate, which is free to revolve in the base of the instrument. The magnetometer & the ring can both be rotated independently of the base which is with leveling screws. The compass box consists of a bakelite base with metal dial of diameter 100mm graduated in degrees & with anti-parallax mirror. Cobalt steel magnet & aluminium pointer are mounted on special synthetic sapphire. The needle moves on special pivot. This combination makes the needle virtually frictionless.
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