Oil Engines. 



force air into W, so that the oil is under a pressure of about 40 lb. 

 per square inch, and the burners then burn the petroleum with 

 a clean flame and heat the tube U. The engine can then be 

 started by the ignition of the cylinder charge forced by the com- 

 pression into this hot tube. After the engine has run a few 

 minutes the pressure in the vessel W may be let off and the 

 lamps extinguished. 



The Britannia Company, of Colchester, is also now making 

 an oil engine working without extraneous means of ignition 

 after starting. 



Fig. 8.— Starting Lamp of Clayton & Shuttleworth 

 Oil Engine. 



As representing the type of engine in which the ignition of 

 the working charge is effected by a tube heated by a small 

 automatically, supplied lamp which also heats the vapouriser, 

 that of Messrs. Crossley Bros, may be specially noticed. They 

 are made of all sizes, from i| brake horse- power to 50 horse- 

 power, and in the fixed and portable forms. The cycle of 

 operations in the working of the engine is the same as that 

 already described, but the vapouriser is kept at a constant 

 temperature, so that the quality of the oil vapour charge 

 remains unaffected by varying load, and the total quantity of 

 oil used per horse-power is not prejudicially affected by using 



