442 



Oil Engines. 



charge ; (3) outstroke, i.e., working stroke effected by the 

 combustion of the charge ; and (4) instroke during which the 

 products of combustion of the working stroke are ejected, i.e., 

 the exhaust stroke. 



The oil is not injected as a spray into the vapouriser, but 

 dropped at only atmospheric pressure into a passage forming 

 part of the vapouriser. The oil is lifted from the tank formed 

 in the engine base by a very simple form of pump to a small 

 measuring cistern above the engine cylinder. In this is an oil 

 measuring thimble controlled by the governor. The tiny charge 

 of oil measured off for each working stroke falls down a small 

 pipe, which is seen at f 'm the diagram, Fig. 5. A small quantity 



Figs. 4 and 5. 



-Vapouriser and Cylinder of Ruston & Proctor 

 Engine. 



of air also enters this pipe with the oil. Fig. 4 is a longitudinal 

 section of the engine cylinder with a piston p y combustion 

 space 0 connected to a vapouriser a, h\ c, d, with tortuous 

 passages, into which the oil enters at f s and a further small 

 supply of air at g. This air, drawn in by the suction action of 

 the piston, passes at high speed round the spiral passage d 

 formed round the vapouriser block carrying with it and 

 triturating and vapourising the oil, the vapour and air or 

 carburetted air at a temperature of about 400 deg. F. escaping 

 from the spiral passage into the lowest passage e ) past the 

 valve k, and by the short passage e into the larger passage b, 

 and thence into the cylinder. Here it mixes with a larger 

 supply of air entering at the valve / and fills the cylinder, the 



