Sonic pulse generator

Claim 1

A WATERTIGHT DEVICE FOR GENERATING A SERIES OF EASILY DISTINGUISHABLE SONIC PULSES UNDER WATER, WHICH CAN BE FIELD ADJUSTED TO REGULATE THE INTERVAL BETWEEN THE SONIC PULSES AND WHICH COMPRISES A TUBULAR SHELL, AN IGNITION ASSEMBLY SEALING ONE END OF THE SHELL, A PLURALITY OF INDIVIDUALLY REMOVABLE SONIC PULSE UNITS DISPOSED WITHIN THE SHELL, A REMOVABLE CAP CLOSING THE OTHER END OF THE SHELL, AND A SLEEVE OF ELASTIC MATERIAL PERIPHERALLY ENGAGING THE EXTERIOR OF THE CAP AND THE SHELL AND SEALING THE JOINT THEREBETWEEN, EACH OF SAID INDIVIDUALLY REMOVABLE PULSE UNITS COMPRISING A TUBULAR CONTAINER OPEN AT THE END NEAREST SAID IGNITION ASSEMBLY AND CLOSED AT THE OTHER END BY A THIN WALL AND, IN SEQUENCE FROM SAID THIN WALL, A FIRST THICK-WALLED TUBE PERIPHERALLY ENGAGED BY THE INTERIOR WALL OF SAID CONTAINER AND HAVING AN AXIAL BORE FILLED WITH DETONATING EXPLOSIVE AND A SECOND THICKWALLED TUBE IN SNUG PERIPHERAL ENGAGEMENT WITH THE INTERIOR WALL OF SAID CONTAINER AND HAVING AN AXIAL BORE FILLED WITH DEFLAGRATING EXPLOSIVE, THE EXTERIOR OF SAID CONTAINER BEING IN SNUG PERIPHERAL ENGAGEMENT WITH THE INTERIOR WALL OF SAID SHELL, AND THE QUANTITY AND DISTRIBUTION OF DETONATING EXPLOSIVE BEING SUCH THAT ITS DETONATION WILL NOT RUPTURE THE DEVICE WHEN IT IS IMMERSED IN WATER.