A useful piece of apparatus for investigating the motion of projectiles. Launch a projectile at any angle from -15° to +90° straight up.
Durable, unbreakable. Aluminium construction with hardened steel latches. String release trigger mechanism with 2 bore sights. Pivots from horizontal to 90 degrees. 19 mm diameter ball with hole is easy to use fixed launch position. Trajectories vary less than 1 cm because ball does not spin when launched.

Includes assembled spring loaded gun, two balls of aluminium, protractor, plumb bob and complete with operating instructions.