Experiment to show that the ball passes through to the ring when cold but will not pass through after being heated. Comprising a brass ball 25 mm dia, a brass ring mounted on a rod with a handle, a chain is provided to hold the ball with the ring. 171.1 Mounted on a tripod base.

Experiment to show that the ball passes through to the ring when cold but will not pass through after being heated. Comprising a brass ball 25 mm dia, a brass ring mounted on a rod with a handle, a chain is provided to hold the ball with the ring. 171.1 Mounted on a tripod base.