Abstract: On a base plate 13 there are provided L-shaped posts 16 and 17 having horizontal arms 16a and 17a and upright portions 16b and 17b, respectively, and a shooting target 11 is provided exchangeable manner between the upright portions. On the base plate 13 there is arranged a video camera 14 obliquely with respect to the shooting target 11. A picked-up image of the shooting target 11 is supplied to a processing device 15. On the horizontal arms 16a and 17a, there is arranged a reflection mirror 18 movably. The mirror 18 is adjusted such that light scattered by the mirror is made incident upon the video camera 14 through a bullet hole C formed in the shooting target 11 with a bullet A discharged from a gun P. An image of the bullet hole C is picked-up as a bright spot, so that a position of the bullet hole in the shooting target can be detected accurately and easily.

Abstract: A control system is disclosed for supplying air to a torque control device of the type having a first and a second rotary member, a drum carried by one of said rotary members, a friction shoe carried on an inflatable member affixed to the other rotary member and adapted to expand so as to press the friction shoe onto the drum to transmit torque between the first and second rotary members. The control air is supplied to the inflatable member in accordance with the slip taking place between the two friction members, whereby the slip is ceased to protect the friction members from the heat which would otherwise generate and accumulate during the slip.