| Show mystery clock on glass dial an ancient trick the so called mysterious clock in which the hands rotate on a pin fastened on a glass dial without any visible means of making them go is based on a principle about years old observes a writer in the washington post each hand has a circular box on the end beyond the center like a counterpoise in the box on the minute hand is a watch movement the center arbor of which is tas fas bened into the center of the inside of the box one side of the minute hand is weighted heavier than the other the whole weight of the hand is poised on the center of the hand in the turning of the movement fastened to the hand by the center arbor the heavy side of the move ment seeks the lowest possible tion and in doing this turns the hand just as fast as the center ar bor turns that is the hand moves at the rate of one turn per hour thus spacing the minutes on the dial the hour hand has fastened to its box or counterpoise another move ment arranged like that on the mm min ute hand except that it is fastened by its hour wheel pipe and conse spaces off hours on the dial when it is running both hands run on holes through which passes the pin to the center of the dial the hands can be taken off the pin and replaced on it at any point on the dial the watch movement must be wound once a day and may be regulated in the ordinary way |
