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acoustic axis adjusted applied attenuator available power baffle beam width calibration Chapter characteristics chart circuit coaxial computation correction coupling coupling loss crest factor crystal decibels depth detector device diaphragm directivity index directivity pattern dome ducer dyne per sq echo-ranging electric electric impedance electric terminals equation equipment factors filter frequency range gear hydrophone impedance impedance bridge input instrument laboratory magnetostrictive maximum measurements ments meter method modulator Mountain Lakes NDRC obtained ohms open-circuit voltage operation oscillator oscilloscope output pier piezoelectric piston plane preamplifier projector proximity effects pulse quency ratio receiving amplifier receiving response reciprocity recorder reflections resistance resonance rigging rotator shown in Figure signal sonar sound field specular reflection spherical wave standard standing waves surface tank temperature terminals testing distance thyratron tion trans transducer transmission loss transmitting response underwater sound USRL usually velocity watt wattmeter wave length