Blasting explosive assembly

Claim 1

AN EXPLOSIVE ASSEMBLY COMPRISING A MAIN BLASTING CHARGE, AN ELONGATED WELL EXTENDING INTO SAID CHARGE, A TUBULAR CONTAINER FITTING INTO SAID ELONGATED WELL, A HIGH DENSITY CHARGE OF A CAP-SENSITIVE SECONDARY EXPLOSIVE PRESENT IN AN AMOUNT GREATER THAN 3 GRAMS WITHIN SAID TUBULAR CONTAINER, A LINER OF RIGID MATERIAL POINTED AT THE BOTTOM AND ROUNDED AT THE TOP PRESSED INTO SAID DENSE CHARGE TO FORM A CAP WELL THEREIN, A CYLINDRICAL INITIATOR POSITIONED WITHIN SAID CAP WELL, A RETAINER FOR SAID INITIATOR COMPRISING A WASHER OF RESILIENT MATERIAL, A SUPERPOSED METAL WASHER AND AN INTERNAL CRIMP IN THE SAID TUBULAR CONTAINER WALL ABOVE SAID WASHERS HOLDING THEM IN POSITION, SAID RESILIENT WASHER HAVING A DIAMETER SUBSTANTIALLY THE SAME AS THAT OF THE SAID CONTAINER AND A CENTRAL PERFORATION SMALLER IN DIAMETER THAN THE SAID CYLINDRICAL INITIATOR, SAID INITIATOR BEING INSERTED THROUGH SAID PERFORATION.