1. A TIMING DEVICE, COMPRISING: (A) A CYLINDRICAL HOUSING MEMBER HAVING A CHAMBER THEREIN WITH FIRST AND SECOND OPPOSITE OPEN ENDS; (B) A FLUID RESTRICTOR ASSEMBLY MOUNTED IN SAID FIRST OPEN END INCLUDING A SILICONE RUBBER RESTRICTOR TO RESTRICT THE FLOW OF A GAS FROM SAID CHAMBER, A POROUS DOWNSTREAM FILTER MOUNTED ADJACENT SAID OPEN END OT SUPPORT SAID SILICONE RUBBER RESTRICTOR, AND A POROUS USPTREAM FILTER MOUNTED ADJACENT SAID CHAMBER TO ACT AS A PRELIMINARY FILTER AND AS A HEAT SINK TO ABSORB HEAT FROM A GAS PASSING THROUGH SAID RESTRICTOR ASSEMBLY; (C) A CARBON DIOXIDE GENERATOR MOUNTED IN SAID CHAMBER INCLUDING A PELLET OF SOLID PROPELLANT MATERIAL HAVING A METAL BRIDGE WIRE MOUNTED ADAJCENT THERETO; (D) A PAIR OF METAL ELECTRODES MOUNTED IN SAID HOUSING MEMBER AND CONNECTED TO OPPOSITE ENDS OF SAID BRIDGE WIRE; (E) MEANS INCLUDING PRESSURE SENSING MEANS MOUNTED IN SAID CHAMBER AT SAID SECOND END TO SEAL SAID SECOND OPEN END AND TO PROVIDE AN OUTPUT INDICATIVE OF THE PRESSURE IN SAID CHAMBER;