Record playback instrument control system - has scanning needle pressure regulated to give varying force as function of amplitude of recorder signals
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Marine acoustic echo depth sounder with digital display - times echo of transmitted pulse via gating network and threshold detector
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Instrument housing with damped resilient legs - has bolt joined to foot snapping into engagement with sleeve
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Compact balanced record player stylus arm - uses balancing weight to reduce arm overhang hung on wire in arm support column
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Method and circuit arrangement for constant speed control of the drive motors of turntables and / or cassette recorders
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Process for suppressing or identifying interference signals in echo sounding systems
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Device for adjusting the vertical toe angle of the scanning needle
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Endless flat belt for an echo sounder recorder
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SOUND RECORDER
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Method for echographic recording, in particular writing registration, of the depth of an underwater vehicle
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Data recorder with transported recording strip - fed between two rollers via deflection roller or angled guide surface for level winding on take-up spool
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Method for casting the housing of a water-borne sound transducer
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Electromagnetic sound pickup with two magnetic circuits - is for scanning of two component sound tracks and includes U-shaped iron core
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Drive belt replacement in record players - involves locating belt on turntable wheel and spigot and rides over incline onto drive wheel
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Automatic cleaning brush for gramophone needle - is pivoted to sweep past needle point and mechanical interlock can provide automatic sweep before each playing
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Sound pick-up arm control mechanism - raises lowers and moves control arm in horizontal plane against spring restoring force
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PROCEDURE AND CIRCUIT ARRANGEMENT FOR SUPPRESSION OR IDENTIFICATION OF INTERFERENCE SIGNALS IN SOUND SOUND SYSTEMS
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DEVICE FOR DRIVING THE PLATTER OF A RECORD PLAYER, IN PARTICULAR A DISC CHANGER
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PROCEDURE AND CIRCUIT ARRANGEMENT FOR SPEED CONTROL FOR A DC MOTOR
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Ultrasonic underwater echo sounding equipment - is especially for fishing boats and has suppression of double echos without need for recording delay
