(The model exhibited here includes components of modern construction. The source of power is obviously also modern).
Heron's Aeolοpile exploits the pressure of vapor, converting it into motive rotary force. The steam produced in the boiler is directed through pipes into the sphere and is then ejected under pressure through two nozzles in opposite directions, causing the sphere to spin. It is considered a precursor of the steam engine; only a simple chain-belt should be added, in order to transfer the rotary motion to a pump.
(The model exhibited here includes components of modern construction. The source of power is obviously also modern).