one of the laws of projected bodies. If a body is pro jected or thrown in a horizontal direction it will take no longer to reach the ground than one that is drop ped at the same moment. Thus if two marbles are simultaneously released over a level floor and if to one of them a strong horizontal impulse is given so as to throw it a considerable distance both will reach the ground at the same instant although one travels a much greater distance than does the other and they will make but one sound as they strike provided all the adjustments are correct. A board about ten inches long and five inches wide is mounted on two pieces one at each end. On its for ward end at one side a little platform or trap door two inches square is hinged. An India rubber band extends diagonally from the outer corner of this trap door downward to the main piece. Thus the door is drawn strongly downward. With a center bit a hole is made partly through the platform. The end of the board at its other side is free. On its upper surface running back from this plate two strips are secured making a groove about an inch wide. Within this a block of wood two inches long slides fitting closely but moving with little friction. A band of India rub ber is fastened to and extends forward from its front end and is secured to the board near its front. These two parts are intended to receive two marbles. One rests on the trap door. The hole gives it a good resting place. The other runs in the groove in front of the movable block and can be discharged by it a dis tance of ten feet or more. A wire catch is arranged so as to hold up the trap door but is released when a ball is thrown from the groove. Its arrangement is clear from the cut. The catch is set so as to hold up the trap door and a marble is placed thereon. Another marble is placed in the groove the block being previously drawn back. The marble rests in front of and in contact with the sliding block. It is well to have a trigger arrangement for holdin
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