Steam Engine Model

GRAVESANDE – Ring and Ball with Chain. An apparatus for demonstrating thermal expansion, comprising a captive brass ball secured to a mounted brass ring by a chin, Ring mounted on rod with a wooden handle. The ball passes through the ring when cold but will not pass through after being heated

The model demonstrates the principle operation. It is cut way to show the internal constructional details.

The power piston is an arch like triangular rotar which on rotating generates an epitrechoid. Mounted on base.