Miscellaneous Imjplemenis Exhibited at WarwicJc. 535 
parts, one part forming a tank of 250 gallons capacity for the 
circulating water, while the forward part forms the silencing 
box for the exhaust from the engine, and has the exhaust funnel 
mounted on it. Underneath the water tank, and corresponding 
in appearance to the lower portion of the fire-box and ash-pan 
of a steam engine, is a rectangular vessel capable of holding 
36 gallons of oil, the whole being mounted on wheels. 
The water circulating pump and the oil supply pump are 
Fio. 4. — Hobey’s Portable Petroleum Engine. 
both worked direct from the cam shaft. The oil is delivered 
into a passage outside the combustion chamber at a pressure of 
about 160 lb. At first starting, a fan worked by hand and a 
simple Lucigen oil lamp are used for a few minutes to raise the 
combustion chamber to the proper temperature, after which the 
repeated explosions maintain the temperature sufficiently. The 
air and exhaust valves work continuously on a constant lift, 
actuated by levers and cams on the side shaft, but the admission 
VOL. Ill, T. S. — 11 PP 
