1. A MECHANICAL FUZE FOR SPINNING PROJECTILES COMPRISING A FUZE BODY HAVING A FUZE BOTTOM MEMBER IN THE BOTTOM END OF THE BODY, SAID FUZE BOTTOM HAVING AN OBLIQUE SURFACE THEREIN ON ONE SIDE THEREOF, A COMPRESSION SPRING IN THE TOP END OF THE FUZE BODY, A FIRING PIN MOUNTED IN THE FUZE BODY WITH ONE END IN AND IN CONTACT WITH THE SPRING AND BEING UNSYMMETRICAL RELATIVE TO ITS LONGITUDINAL AXIS AND ALSO HAVING A CONTACT POINT AT THE OTHER END, SAID FUZE BOTTOM HAVING A GROOVE THEREIN ON THE OTHER SIDE THEREOF TO RECEIVE THE CONTACT POINT OF THE FIRING PIN IN THE SAFETY POSITION OF THE PROJECTILE FUZE, A RETARDING ELEMENT ON THE FUZE BOTTOM ADJACENT THE GROOVE AND ADAPTED TO BE CONTACTED BY THE CONTACT POINT ON THE FIRING PIN, SAID IN HAVING A PROJECTION THEREON APPROXIMATELY INTERMEDIATE THE ENDS THEREOF TO SLIDE AND BE GUIDED BY THE OBLIQUE SURFACE ON THE FUZE BOTTOM, AND MEANS ON THE FIRING PIN OPERATIVE BY CENTRIFUGAL FORCE TO URGE THE FIRING PIN POINT OUT OF THE GROOVE AND OVER THE RETARDING ELEMENT, MOVEMENT OF SAID FIRING PIN BEING ARRESTED BY CONTACT OF SAID PROJECTION WITH THE OBLIQUE SURFACE ON THE BOTTOM MEMBER DURING THE FLIGHT OF THE PROJECTILE AND AFTER CENTRIFUGAL FORCE HAS FORCED SAID PROJECTION AGINST SAID OBLIQUE SURFACE THE SPRING FORCE OVERCOMES A DIMINISHING CENTRIFUGAL FORCE CAUSING THE PROJECTION TO SLIDE ON THE OBLIQUE SUR-