Piezoelectric voice range transducer

Claim 1

AN UNDERWATER LOUDSPEAKER OPERABLE IN THE VOICE RANGE WHICH COMPRISES: AN OPEN ENDED CYLINDRICAL TUBULAR HOUSING, FIRST AND SECOND DIAPHRAGMS SECURED WITHIN SAID HOUSING IN A FLUID TIGHT RELATIONSHIP WITH RESPECT TO THE INNER WALL SURFACE OF SAID HOUSING EQUI-DISTANT FROM AND PARALLEL WITH A PLANE THROUGH THE CENTER OF SAID HOUSING PERPENDICULAR TO THE AXIS OF SAID HOUSING, A PIEZOELECTRIC ENERGY CONVERTER MEANS SECURED WITHIN SAID HOUSING BETWEEN SAID FIRST AND SECOND DIAPHRAGMS UNDER SLIGHT COMPRESSION, MEANS PASSING THROUGH SAID PIEZOELECTRIC ENERGY CONVERTER MEANS COAXIAL THEREWITH AND MECHANICALLY SECURED TO SAID FIRST AND SECOND DIAPHRAGMS FOR SLIGHTLY COMPRESSING SAID PIEZOELECTRIC ENERGY CONVERTER MEANS, A TRANSFORMER HAVING A PRIMARY AND SECONDARY WINDING MOUNTED WITHIN SAID HOUSING IN THE AREA BETWEEN SAID DIAPHRAGMS, SAID SECONDARY WINDING OF SAID TRANSFORMER ELECTRICALLY COUPLED TO SAID PIEZOELECTRIC ENERGY CONVERTER TO SUPPLY ELECTRICAL POWER THERETO, AND MEANS CONNECTED WITH SAID PRIMARY WINDING OF SAID TRANSFORMER FOR CONDUCTING ELECTRICAL ENERGY THERETO FROM A SOURCE EXTERNALLY OF SAID HOUSING.