710 
The Trials of Oil Engines at Cwmbndge. 
mingles with the oil jet in the chamber u'. It then passes on 
through the vaporising tube 13 and ignition tube A, and thence 
into the combustion chamber, where it meets the main air 
supply. On the compression stroke the valve between A and B 
is closed, and firing takes place in the usual manner. The 
ignition tube is kept free from all chance of fouling by the 
current passing through it, and the arrangement ensures very 
complete vaporisation of the oil. A lamp enclosed in an iron 
casing maintains the vaporiser and ignition tube at the proper 
temperature. The oil is injected by a small suction pump, and 
the lamp is supplied from a separate reservoir kept under air 
Fig. 10. — Elevation showing arrangement of valve levers and trip gear of 
Fielding & Platt’s Oil Engine. 
pressure by a hand-pump. There is an arrangement by which 
this pressure is maintained during working through a by-pass 
and valve, which open communication with the cylinder at 
the end of the exhaust stroke. The valves — -air, vapour, and 
exhaust — are all driven (fig. 10) from one cam, and the governor, 
of the hit-and-miss type, cuts out explosions when the engine 
runs too fast, holding the exhaust valve open and the air and 
vapour valves closed. 
The whole engine, with the exception perhaps of the main 
oil reservoir, which is flimsy and might prove dangerous, is very 
compact and simple, and of handsome appearance. The work- 
manship is also good. 
