Head of Water unit

Represents a typical air cooled, side-valve four-stroke petrol engine with the operation of the valves clearly evident, cams being driven by a gear train from rear of the main crank. As with the two-stroke model, simulated spark plug uses a small lamp to indicate the firing point. Screw terminals are provided for connection to 3 Volts battery. Cross-section of carburetter is shown. Mounted on base

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.