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adjustment alter alternating current amplifier amplitude amplitude of vibration applied armature axis balance weight beam bending blade cantilever cathode-ray cathode-ray tube causes centre of gravity centrifugal force cloth gilt coupling crankshaft cylinder damper damping deflection demy 8vo depends dial gauge disc effect elastic electrical energy engine equation exciting force fatigue film flexible fluid flywheel fork fracture frequency meters friction galvanometer high-frequency increase inertia mass instrument isochromatic lines isoclinic lines light load machine magnet magnified material measure mechanical vibrations metal modulus modulus of rigidity motion motor mounted move movement natural frequency obtained operate oscillations oscilloscope out-of-balance panel pendulum piston position possible principal stresses produce propeller reciprocating engines record resistance resonant rigidity rotating Rotol rotor rubber shown in Fig slip-rings speed spring stiffness strain gauges stroboscope structure suitable superimposed vibrations surface swing torque torsional vibrations tuning twisting unbalanced usually varies velocity vibratory vibrograph wire