shaft or can be decreased by moving the counterweight 26 further up moreover the dynamic action produced by the target system can be varied by adjusting the position of the counterweight 26 for example for simple 34 knock down 34 effect the counterweight 26 would be positioned on the lower shaft 18 so that the impact of a bullet of a given caliber weight and speed would cause rotation of the bearing to a point where the shafts would be approximately horizontal so that the target plate 10 would momentarily disappear and then reappear when the counterweight 26 restores it to the upriqht position for more expert marksmen the counterweight 26 could be moved upward on the lower shaft to reduce the counter torque so that a single hit on the target plate 10 would produce at least a hundred and eighty degree rotation of the shaft and bearing mechanism so that the counterweight 26 would move past a position directly above the cylindrical bearing 16 to complete a full rotation as the target plate 10 swung around to its original upright position another bullet hit would increase the rotational momentum to bring the target plate 10 into its upright position quicker than during the previous rotation subsequent hits would gradually increase the rotational speed to the point where the target plate 10 would appear at progressively briefer intervals and for shorter periods until the skill of the marksman was over matched when this occurred subsequent misses would result in gradual decrease of the rotational speed so that the intervals between successive target appearances would automatically adjust to the prevailing skill of the.