One meter long plywood base, fitted with graduated scale, brass C.P. connecting strips and terminals, can be used for 2 gaps as well as for 4 gaps, with pencil type jockey.
A. Polished Laminated Board, superior
B Polished Laminated Board Regular
C. With full Sunmica sheet on Base
D. Deluxe Model with spring type jockey sliding on rod

With brass C.P. point and teminal

For direct measurement of electrolytic resistance. Comprising a calibrated scale .05-10 ohms and multiplier ratio dial, giving 6 ratios 0.1, 1, 10, 100, 1000 and 10000. It is useful for quick determination of resistance too when galvanometer replaces the headphone in the detector circuit, provided with fixed circular scale, manganin coils. Accuracy + 0.1%
A. without induction coil and head phone
B. complete with induction coil and head phone

Sensitive, to be used with kohlrausch conductivity bridge

Extra sensitive,to be used with kohlrausch conductivity bridge

Carey Fosters Bridge and Potentiometer, 3 instruments in one. It is an improvement over the potentiometer. The 50 cm long slide wire of 1 ohm resistance is calibrated into 100 equal parts. 14 coils are arranged in series in dial form, each being of 1 ohm resistance. Jockey sliding on brass rod, accuracy of adjustment ± 0.05%

Cambridge type, heat treated, inding of the purest form of platinum wire, enclosed in a borosil glass grounded tube. Resistance app. 2.8 ohms, fundamental interval 1 ohm, with four terminals

For comparison of capacities of condensers. Accuracy ± 0.05% to ± 0.1%

For measurement of inductance in terms of capacity and resistance. The panel comprising : Three ratio dials, each having resistance of x10, x100 and x1000 ohms forming one arm. The other arm has also got threedecade dials of the same values for inclusion in the inductance circuit.
Three more decade dials of x.1, x1 and x10 ohms with terminals for extension of the arm. The coils are non inductively wound, properly aged and heat treated, calibrated to ± 0.05% to ± 0.1% complete with a low noised buzzer and head phone

Same as above but provided with transistorised bridge oscillator to eliminate disturbance of noise produced by the buzzer