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acceleration accelerometer accuracy acoustic air speed aircraft airspeed airspeed indicator anemometer angle angular apparatus applications axis ballistocardiography barium titanate bibliography calibration capacitor characteristics circuit coil comprising deflection described detection detector determination developed device differential dimensional analysis discussed displacement Doppler dynamic electrical electronic element energy engine equipment error evaluation experimental flight flow fluid force frequency gages gauge gyroscopic indicator INST INSTR instrument interferometer June linear liquid mach number magnetic manometer mass means connected measurands mechanical ment meter method motion motor mounted movable movement Naval operation optical oscillator output peek-a-boo pickups piezoelectric position potentiometer pressure primary terms pulse range recording references REPT Research response rotation rotor Royal Aircraft Establishment seismic seismometer sensitive Sept shaft shock signal standard strain gauges surface tachometer TECH technique telemetering temperature thyratrons transducer tube U. S. Patent ultrasonic vibration voltage wave wind wire