15-30 Mogul tractor, Prony Brake, Electro-Magnetic Engine, 1898 Hercules
USD 17.11 USD
The Design, Construction and Use of a Small Prony Brake (6.5 pages). - Restoration of an 1898 Hercules Gas Engine (1 page). The Gas Engine Magazine. - The History of the Electro-Magnetic Engine (1 page).