Hollow electro-acoustic transducer

Claim 1

AN ELECTRO-ACOUSTIC TRANSDUCER COMPRISING AN ELONGATED HOLLOW STRENGTH MEMBER, END PIECES SECURED TO AND CLOSING THE ENDS OF SAID MEMBER, A PLURALITY OF CYLINDERS OF ELECTROSTRICTIVE MATERIAL OF MATERIALLY GREATER INTERNAL DIAMETER THAN THE EXTERNAL DIAMETER OF SAID MEMBER, DISPOSED CONCENTRIC WITH SAID MEMBER AND SPACED APART IN TANDEM THEREON, ELEMENTS OF RESILIENT MATERIAL ON SAID MEMBER AND INTERPOSED BETWEEN SAID CYLINDERS, AND BETWEEN SAID CYLINDERS AND SAID MEMBER FOR SPACING SAID CYLINDERS APART, END TO END, AND ALSO FOR HOLDING SAID CYLINDERS IN SPACED RELATION TO SAID MEMBER, AND THUS PROVIDING AN AIR SPACE BETWEEN THE CYLINDERS AND MEMBER, SAID CYLINDERS HAVING ELECTRODED INNER AND OUTER SURFACES, CONDUCTORS ENTERING SAID MEMBER FROM ONE END PORTION THEREOF THROUGH A WATERTIGHT SEAL AND PASSING ALONG WITHIN SAID MEMBER, THEN PASSING THROUGH THE SIDE OF SAID MEMBER AND CONNECTED TO SAID ELECTRODED SURFACES OF SAID CYLINDERS, AND A BOOT OF ELASTIC SOUND TRANSPARENT WATER IMPERVIOUS MATERIAL FITTED SNUGLY OVER SAID CYLINDERS AND MEMBER AND FORMING A WATERTIGHT SEAL WITH SAID END PIECES.