Oil Engines. 



45i 



From Fig. 12 the method of working the exhaust valve by 

 the lever O will also be seen. 



The Campbell engine is one of the ignition tube type, and is 

 widely known in its fixed and portable forms. It is of simple 

 construction and is made in various sizes, from 1 h.p. to 100 h.p., 

 and also as a portable engine for farm and general purpose 

 work. The distinctive features of the engine may be described 

 with reference to the vapouriser and ignition devices as shown by 

 t i°"S. 1 3, I4> 



and 1 5. The engine has but two valves, one the air 



Fig. 12— Brown & May's Oil Engine, 3 h.p.— End View of 

 Vapouriser, Valve Motion, and Governor Connection. 



admission valve, which works automatically, and the exhaust 

 valve at the back of the cylinder. 



The air admission valve A, Figs. 13, 14, is also the oil ad- 

 mission valve. On the suction stroke of the engine air enters 

 at B, and in passing the valve carries with it oil admitted by the 

 inlet C into a small annular space D above the valve seat, and 

 thence by the small holes E on the valve seat. The oil admitted 

 by these holes is swept violently by the air into the chambered 

 space surrounding the valve A, Fig. 1 5, at the top of the vertical 

 vapouriser, and in the rush is broken up into spray and vapourised 



O O 2 



