Oil Engines. 



449 



required. The consumption of oil and the general construction 

 of- the engine itself are the same as with the fixed engines. For 

 driving any machine at high speed, the belt may run on the 

 fly-wheel either fore or aft, and slower speed machines from the 

 pulley on the other end of the crank shaft. 



The construction of the Tangye engine is illustrated by 

 Fig. 10 as to its cylinder, vapouriser and heating lamp. The 

 cycle of operations is the same as that described with reference 

 to the other engines, but the construction differs in several 

 respects. 



From Fig. 10 it will be seen that the air admission valve A 



Fig. ii.— Brown & May's 3 h.p. Oil Engine-Section. 



admits the incoming charge of air directly into the vapouriser 

 V, which communicates with the cylinder through a junction 

 pipe V 1 . The oil is admitted above the seat of the valve A, and 

 is broken up as it is swept with the air into the vapouriser. 

 The air valve is mechanically controlled by the governor, and 

 an air cushion piston is fitted on the stem at C to ensure steady 

 closing of the valve on its seat. The engine is started by 

 heating the vapouriser with the lamp N O supported on the 

 pillar P. A small quantity of oil is put into the cup O and 

 ignited, thus heating the pipe K carrying the burner nipple N. 

 When this is hot oil is gradually admitted from the trunk pipe 



O Q 



