Electroacoustic transducer

Claim 1

AN ELECTROACOUSTIC TRANSDUCER, ADAPTED TO BE SUBMERGED IN SOUND-PROPAGATING LIQUID MEDIA, COMPRISING A PAIR OF BORED, COAXIALLY-DISPOSED RADIATOR MASSES, ADAPTED TO BE ACOUSTICALLY EXPOSED TO SAID SOUND-PROPAGATING MEDIA, THE GREATER PORTION OF SAID RESPECTIVE RADIATOR MASSES BEING IN JUXTAPOSITION WITH RESPECT TO EACH OTHER AND ONE OF SAID RADIATOR MASSES TELESCOPICALLY OVERLAPPING THE OTHER OF SAID RADIATOR MASSES AT THEIR MUTUALLY-NEAREST RESPECTIVE ENDS SO THAT THE COMBINED BORES OF SAID RADIATOR MASSES FORM AN ENVELOPE, THE OVERLAP OF SAID ONE RADIATOR MASS BEING RADIALLY SPACED, WITH RESPECT TO THE COMMON AXIS OF SAID COAXIALLY-DISPOSED RADIATOR MASSES, FROM THE UNDERLAP OF SAID OTHER RADIATOR MASS; ELECTRICALLYACTUABLE ELECTROMECHANICAL CONVERTER MEANS DISPOSED WITHIN SAID ENVELOPE AND VIBRATILE IN LONGITUDINAL MODE FOR DRIVING SAID RESPECTIVE RADIATOR MASSES IN ANTI-PHASE VIBRATORY RELATIVE MOVEMENT WITH RESPECT TO EACH OTHER, EACH OF SAID RADIATOR MASSES HAVING A SUBSTANTIAL PORTION OF ITS TOTAL MASS EXTENDING ALONGSIDE SAID ELECTROMECHANICAL CONVERTER MEANS IN A DIRECTION SUBSTANTIALLY PARALLEL TO THE LONGITUDINAL AXIS OF SAID CONVERTER MEANS AND SPACED FROM SAID CONVERTER MEANS, SAID ELECTROMECHANICAL CONVERTER MEANS BEING BONDED, AT ITS RESPECTIVE LONGITUDINALLYOUTERMOST ENDS AND SOLELY ALONG A PATH SUBSTANTIALLY NORMAL TO THE LONGITUDINAL AXIS OF SAID ELECTROMECHANICAL CONVERTER MEANS, TO EACH OF SAID RADIATOR MASSES; ELECTRICALLY-CONDUCTIVE MEANS, CONNECTED TO SAID ELECTROMECHANICAL CONVERTER MEANS, FOR CONVEYING AN ACTUATING ELECTRICAL SIGNAL TO SAID ELECTROMECHANICAL CONVERTER MEANS; AND MEANS DISPOSED BETWEEN SAID RADIATOR MASSES AT THE AREA OF OVERLAP FOR CONCURRENTLY PRESENTING A SEAL TO PREVENT EXTERNAL FLUID MEDIA FROM ENTERING SAID ENVELOPE AND MAINTAINING THE RADIAL SPACING BETWEEN SAID RADIATOR MASSES IN THE AREA OF OVERLAP SO THAT SAID RADIATOR MASSES MAY FREELY MOVE BACK AND FORTH WITH RESPECT TO EACH OTHER IN A SUBSTANTIALLY FRICTIONLESS MANNER.