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ELECTRICAL INDICATING INSTRUMENTS

Almost invariably an indicating instrument is fitted with a pointer which indicates on a scale the value of the quantity being measured. The moving system of such an instrument is usually carried by a spindle of hardened steel, having its ends tapered and highly polished to form pivots which rest in hollow-ground bearings, usually of saphine, set in steel screws. In some instruments, the moving system Is attached to thin ribbons of spring material such as beryllium-copper alloy, held taut by tension springs mounted on the frame of movement. This arrangement eliminates pivot friction and the instrument is less susceptible to damage by shock or vibration.