Three in one - Carry's Foster Bridge, Potentiometer & Callender & Griffith’s 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.
Accuracy : + 0.05%
Housed In Wooden Attractive Cabinet Made of Australian Pine Wood.