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30 inches ABODE in fig abscissa actual curve actual motion actual trace AGCHE altered angle arrangement average deviation axis barograph belt of circular circular section comparison curve comparison S.H. comparison S.H.M. cones Constituent Harmonic constructed cophasal cos2 crown wheel crown-wheel axle curve APBSC Description distance DQETF electric motor equal equation error of motion expression fixed pulleys Form of Harmonic free end greater than PQ greatest deviation Harmonic Analyser Harmonic Synthetiser hence horizontal hyperbola imaginary imaginary point imaginery point inch in diameter isoperiodic Mathematical Investigation maximum deviation maximum discrepancy means Mechanism which enables minimise ordinate parallel particular S.H. curve passes round phase Phil Plate position powers of r/l present instrument principle employed Proc r/l greater reduced represent a S.H.M. result rotate S.H. wheels satisfactory set to incommensurable shown side wheels simple harmonic wheels summation wire three harmonic wheels trace produced turning values upright varied during motion vertical direction zero