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ALTERNATING CURRENT amplitude anode applied arranged axis B.Sc beam bifilar oscillograph capacity cathode ray oscillograph cent charge coil compared condenser constant control force critical damping current flowing curve D.Sc damping force dead beat diagram diaphragm DIRECT CURRENT Duddell oscillograph Dufour eddy currents ELECTRICAL electro-magnetic electrons electrostatic field electrostatic oscillograph electrostatic units ENGINEERING equal fibre force due frictional force give graph harmonic high frequency hot cathode hot-wire oscillograph increase induction INDUSTRY inertia force instru ions Irwin J. A. Hunter lens magnetic field magnification main circuit maximum megohms ment mirror molecules Motors movement moving 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 speed spot spot produced strips tension tion tube unit length velocity vibration voltage wattmeter wave wire wires CD zero