Construction of Weston Galvanometer
Weston Galvanometer consists of a stationary magnet, moving coil and a soft-iron cylinder inside the coil. The coil is wrapped around a thin and light frame of Aluminum Alloy. Hard Steel pivots are fixed on either side of the frame which is supported on a saphire bearings. The current enters and comes out of it through two light hair springs. The purpose of hair springs is to bring the coil to zero position. There is an arrangement of Aluminium pointer which moves over a graduated scale. The instrument is very sensitive due to : i) Lightness of the frame, ii) Frictionless bearing; iii) Sensitiveness of the spring.
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