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 simple-structured non-contact-guidable magnetic floating device which has stable restoring forces in vertical and horizontal directions perpendicular to the direction of guiding the moving member. At least one inner magnetic member is formed so that magnetic poles are continuously arranged lengthwise thereof. Two outer magnetic members are disposed on both sides of the inner magnetic member in adjacent but spaced relation thereto and formed so that magnetic poles are continuously arranged in a lengthwise thereof. A non-magnetic coupling member is provided apart from the inner magnetic member, for coupling together the two outer magnetic members. A support is provided for supporting and fixing one of the inner and outer magnetic members.

Abstract: A noncontact magnetic bearing has cylindrical magnetic members magnetized axially, slightly different in radius and different in length, disposed in opposite relation to each other, with their magnetic poles of reverse polarities displaced vertically relative to each other. Either the inner cylindrical magnetic member or the outer cylindrical magnetic member can be used as a shaft, and consequently, the other is fixed to a support member. The inner cylindrical magnetic member and the other cylindrical magnetic member are held at a stable and mutual-noncontact state to provide a noncontact magnetic bearing that is stable axially, as well as radially.