Electro-acoustical delay line useful for producing reverberation in electrical musical instruments

Claim 1

APPARATUS FOR TRANSMITTING SOUND COMPRISING OPPOSED END SUPPORTS, A SENDING PIEZOELECTRIC CRYSTAL AND A RECEIVING PIEZOELECTRIC CRYSTAL RESPECTIVELY CONNECTED TO SAID SUPPORTS, BOTH OF SAID CRYSTALS HAVING FLAT BODIES, AND AN ELONGATED SPRING MEANS CONNECTED TO AND BETWEEN SAID FLAT BODIES, THE CONNECTION OF SAID SPRING MEANS TO AT LEAST ONE OF SAID FLAT BODIES COMPRISING A PORTION OF SAID SPRING MEANS FIXEDLY SECURED TO THE SAID ONE FLAT BODY, SAID SPRING MEANS CONSISTING OF AT LEAST ONE COIL SPRING, SAID LAST-NAMED CONNECTION COMPRISING AN END COIL THEREOF WHICH IS ADHESIVELY SECURED TO SAID ONE FLAT BODY AND EMBRACES AN END PORTION THEREOF, A HOOK HAVING A SUBSTANTIALLY PLANAR FLOOR ON EACH OF SAID END SUPPORTS, AND A RIGID CONNECTING ELEMENT FIXEDLY SECURED TO THE OPPOSITE END PORTION OF SAID ONE FLAT BODY AND BEING ROTATABLY RECEIVED BY SAID HOOK AND RESTING ON AND ACROSS SAID PLANAR FLOOR THEREOF WHEREBY SAID RIGID CONNECTING ELEMENT MAY ROTATE IN THE PLANE OF SAID FLOOR AND IN A PLANE PERPENDICULAR THERETO BUT IS RESTRAINED FROM TWISTING MOVEMENT RELATIVE TO SAID HOOK.