Jump on the model of 's Gravesande

Branch of study: mechanics
Inventor: Pieter van Musschenbroek and Willem Jacob s'Gravesande, around 1742

The jump on 'sGravensande  and van Musschenbroek is first mentioned in the 1742 edition of Physices elementa mathematica, experimentis confirmata. It demonstrates the gravitational pull on a horizontally flying body, which runs along parabolic trajectory after leaving the jump.

The jump is made of wood, the tilt angle of its base plate can be adjusted by three brass screws. A line of brass rings is mounted behind the jump on a parabolic path.      
The trajectory is predicted by the positioning of the brass rings. This experiment was used to verify Galileos postulate on the superposition of the horizontal projection and the free fall movements.