to the preloading force of the spring element 61 as a result the inertial igniter 50 is ensured to satisfy its prescribed no fire requirement now if the acceleration level in the direction of the arrow 63 is high enough then the aforementioned inertia force acting on the sliding element 58 will overcome the preloading force of the spring element 61 and will begin to travel downward if the acceleration level is applied over a long enough period of time duration as well i e if the all fire condition is satisfied and the sliding element 58 will have enough time to travel down far enough to allow the ball 57 to be pushed out of the dimple 56 thereby releasing the striker mass 52 and allowing it to be accelerated in the clockwise rotation as a result for a properly designed inertial igniter 50 i e by selecting a proper mass and moment of inertial for the striker mass 52 and the range of clockwise rotation for the striker mass 52 so that it would gain enough energy the striker mass 52 will gain enough energy to initiate the pyrotechnic material 64 between the pinching points provided by the protrusions 65 and 66 on the base element 51 and the bottom surface of the striker mass 52 respectively as shown in the schematic of fig4 the ignition flame and sparks can then travel down through the opening 67 provided in the base element 51 when assembled in a thermal battery similar to the thermal battery 16 of fig1 the inertial igniter is mounted in the housing 10 such that the opening 67 is lined up with the opening 12 into the thermal battery 11 to activate the battery by igniting its heat.