Callender & Griffith's Bridge

Callender & Griffith's Bridge

Three in one - Carry's Foster Bridge, Potentiometer & Callender & Griffiths Bridge. It is an improvement over the potentiometer. The 50cm long slide wire of 1ohm resistance is calibrated into 100 equal parts. 14 coils are arranged in series in dials from each being of 1 ohm resistance terminals arranged for appropriate working of different instruments. Jockey slides on brass rod.