Pyrogen squib

Claim 1

A PYROGEN SQUIB COMPRISING AN IGNITER ASSEMBLY; A CUP-SHAPED CASING RECEIVING SAID ASSEMBLY AND SECURED THERETO, THE END OF SAID CASING BEING SPACED FROM SAID ASSEMBLY TO DEFINE A COMPARTMENT, SAID END BEING WEAKENED SO AS TO BE ABOUT ONE-THIRD THE THICKNESS OF THE WALLS OF SAID CASING; SAID COMPARTMENT BEING SUBSTANTIALLY FILLED WITH AN INTERNAL-PERFORATED BOOSTER GRAIN AND SINGLE PORT NOZZLE PLATE; SAID IGNITER ASSEMBLY COMPRISING A PLUG MEMBER; A PAIR OF LEAD WIRES EXTENDING THROUGH SAID MEMBER, HAVING THEIR OUTER ENDS ADAPTED FOR CONNECTION TO AN ELECTRICAL SOURCE; A BRIDGEWIRE CONNECTING THE INNER ENDS OF SAID WIRES; AN INITIATION COMPOSITION POSITIONED AROUND SAID BRIDGEWIRE; SAID COMPOSITION KCONSISTING ESSENTIALLY OF 34.7% BY WEIGHT LEAD STYPHANATE, 19.3% BY WEIGHT ZIRCONIUM, 45.2% BY WEIGHT LEAD PEROXIDE AND 0.8% BY WEIGHT GUM ARABIC BINDER; A HOLLOW SPACER MOUNTED TO SAID PLUG MEMBER, THE INTERIOR OF SAID SPACER DEFINING A BORE IN WHICH ARE LOCATED SAID BRIDGEWIRE AND SAID COMPOSITION; AN IGNITION COMPOSITION KSUBSTANTIALLY FILLING THE REMAINDER OF SAID BORE; AND A CLOSURE DISC MOUNTED FIRMLY AGAINST SAID SPACER SO AS TO SEAL SAID BORE.