An instrument for throwing stones or other missiles,
   consisting of a short strap with two strings fastened to its ends, or
   with a string fastened to one end and a light stick to the other. The
   missile being lodged in a hole in the strap, the ends of the string are
   taken in the hand, and the whole whirled rapidly round until, by
   loosing one end, the missile is let fly with centrifugal force.