Rocket signal device

Claim 1

A PROTECHNIC SIGNAL PRODUCING CARTRIDGE COMPRISING: A. A SHELL INCLUDING: (1) A CYLINDRICAL THIN-WALLED BARREL ENCLOSING A FIRING CHAMBER; (A) SAID BARREL BEING OF ADEQUATE STRENGTH TO WITHSTAND, WITHOUT EXTERNAL SUPPORT, THE FIRING OF SAID CARTRIDGE, (2) A BASE CLOSING ONE END OF SAID BARREL (A) TO FORM THE BREACH OF SAID CHAMBER AND PRESENT TO SAID CHAMBER A CONCAVE SURFACE FORMING A GAS EXPANSION POCKET AT THE INNER END OF SAID CHAMBER (B) SAID BASE PROVIDING AN AXIAL THREADED NIPPLE HAVING AN AXIAL BORE THEREIN COMMUNICATING WITH SAID POCKET, (C) SAID BORE HAVING A COUNTERBORE IN ITS OUTER END PORTION TO PROVIDE A CAP RECEPTACLE; B. A PERCUSSION CAP MOUNTED IN SAID RECEPTACLE; C. A WADDING DISK SLIDABLY FITTING WITHIN SAID CHAMBER AGAINST THE PERIPHERAL PORTION OF SAID BASE, (1) THERE BEING A SMALL HOLE FORMED AXIALLY IN SAID DISK; D. A SIGNAL PROJECTILE SLIDABLY FITTING WITHIN SAID CHAMBER AGAINST SAID DISK, SAID PROJECTILE INCLUDING: (1) A THIN-WALLED CYLINDRICAL CUP, INVERTED IN SAID CHAMBER TO PRESENT ITS MOUTH TO SAID DISK, (2) A SIGNAL POWDER CHARGE PRESSED INTO SAID CUP TO PARTIALLY FILL THE SAME, (3) AND A FUSE POWDER CHARGE PRESSED INTO THE MOUTH OF SAID CUP OVER SAID SIGNAL CHARGE AND APPROXIMATELY COMPLETING THE FILLING OF SAID CUP WITH SAID CHARGES; AND E. SEALING MEANS APPLIED TO THE OPEN END OF SAID BARREL AND TO SAID PROJECTILE TO RETAIN THE LATTER IN SAID BARREL TO EXCLUDE MOISTURE FROM SAID BARREL.