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 .
Carry’s Foster Bridge, Potentiometer & Callender & Griffith’s Bridge.
Mounted on a thick ply base with sunmica on top fitted with 10 wires of SWG 24 connected in series, clamped under heavy Brass strips of SWG 18 and fitted by screws. Supplied with pencil jockey.
This bridge is used to measure the unknown value of capacitance. The instrument has following in built parts fitted in teak wood case.
AC Source: The Bridge consist of sine wave signal of 1KHZ. The Amplitude of AC switch indicating lamp is provided on the bakelite board. Two sockets are provided for the output of AC signals.
Detector: For detecting small AC signals in the output, the Null Detector is in-built with a digital display.
Unknown value: Five unknown values are provided on the board selected by a Rotary switch.
Circuit Diagram: The circuit layout on the board is quite spread out to facilitate convenient working & clear understanding. 4mm socket are provided for making a connection.
R1, R2 : Two-decade dial of x10 & x100 ohms.
R1, R2: Decade dial of x0.1mfd.
four-gap bridge has a large and heavy brass strip of (SWG No. 18) mounted on a heavy sunmica base of size 45” x 6”. Nine heavy Brass terminals lock type are provided to reduce the resistance to a minimum. The ends gaps are closed by removable brass Binding pieces which are held in position by the terminals. The 24 SWG constantan wire is stretched along the top of wooden meter scale and securely clamped to the Brass end strips so that end errors are negligible. Supplied with pencil jockey .
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