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ALTERNATING CURRENT amplitude anode arranged axis B.Sc beam bifilar oscillograph capacity cathode ray oscillograph cent charge coil compared condenser connected constant control force critical damping current flowing curve D.Sc damping force dead beat diagram diaphragm DIRECT CURRENT Dufour eddy currents ELECTRIC electro-magnetic electrons electrostatic field electrostatic oscillograph electrostatic units ENGINEERING equal fibre force due frictional force give given glass graph harmonic high frequency hot cathode increase induction INDUSTRY inertia force instru ions J. A. Hunter lens magnetic field magnification main circuit maximum megohms ment mirror molecules MOTOR movement moving necessary oscillations oscillo overshoot phase displacement practice pressure produce quency ratio residual gas resonant frequency resonant shunt resonant-shunt screen Second Edition secondary series resistance shown in Fig shows sinusoidal speed spot spot produced strips tension tion unit length vectors velocity vibration voltage wattmeter wave wire wires CD zero