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alternating current ampere amplitude anode arranged axis beam bifilar oscillograph calcium tungstate capacity cathode ray oscillograph cent charge coil condenser connected constant control force critical damping current flowing curve damping force dead beat deflecting plates diagram diaphragm Duddell oscillograph Dufour dynes eddy currents Electric electro-magnetic electrons electrostatic field electrostatic oscillograph electrostatic units Engineering equal farads fibre force due frictional force give given graph harmonic high frequency increase induction inertia force instru ions lens magnetic field magnification main circuit maximum megohms ment mirror molecules movement moving natural frequency necessary oscillations overshoot Perren Maycock phase displacement practice pressure produce quency ratio residual gas resonant frequency resonant shunt resonant-shunt resultant screen secondary series resistance shown in Fig shows sinusoidal speed spot spot produced strips tension tion undamped instrument unit length varies vectors velocity voltage wattmeter wave wire wires CD zero