Head of Water unit

1 copper calorimeter, 1 wooden outer box with felt lining, 1 sliding wooden cover for outer box, 1 copper stirrer with loop to fit inside the copper calorimeter, 1 thermometer holder made of brass, removable.

One cylinder, 4 cycled and double valve system gas engine, to show operations like intake, compression, explosion, exhaust, spark and others, mounted on wooden base with spark plug and battery.