Hand-Built Pence Steam Engines Are Machinist's Legacy

Bull Pup steam engine
The largest of the Pence steam engines, the Bull Dog uses a 15 hp Frick Eclipse stationary boiler mounted on an Avery chassis with a Kelly 2-cylinder industrial engine, a steam-powered generator and headlight. It has a clutched pulley on the left and a continuous-drive pulley on the right. The engine weighs about 10 tons; its rear wheels are over 4 feet tall.
James Boblenz