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accuracy adjustment air-gap alternating current amplifier application armature arms balance bridge circuit calibration capacitance capacitor change in resistance coil connected constant construction convenient coupled crystal element cuit current flowing cycles per second deflection described detecting detector device diaphragm direct current effect electric circuit electric gaging electromotive force Electronics employed Engineers error exciting current frequency gaging circuits gaging element gaging systems galvanometer heat impedance increase indicating instrument inductance-ratio induction balance installed instru magnetic circuit magnitude material measuring mechanical ment metallic method movement moving mutual inductance ohmic resistance operation ordinarily oscillator oscillograph output phase photoelectric pick-up piezoelectric plate possible potential potentiometer pressure primary element produced R-C coupled ratio reactance resistance element resistor resonant Scientific Instruments sensitivity shown in Fig shunt slide-wire specimen strain gage tance temperature tion tube unbalance variable-inductance variable-resistance vibration voltage wave-form Wheatstone bridge wire