704 
The Trials of Oil Engines at Cambridge. 
rise clear under the weight of its inner end before the return 
of the vertical lever, which, therefore, is arrested, and no move-’ 
ment of the valves takes place. The exhaust valve is then kept 
open, and the vapour valve being closed an idle stroke occurs, 
A. Vapour valve, 
o. Horizontal catch, 
l). Vaporiser door. 
)•;. Exhaust valve. 
K. Trip. 
L. Rocking lever. 
M. Oil-supply cock. 
x. „ chamber. 
o. „ pipe. 
p. „ to lamp. 
Q. Automatic explosion 
counter. 
n. Link-working oil valve, 
v. Vaporiser. 
the oil valve at the same time emitting a charge from the 
vaporiser. The oil valve is a rotating taper plug driven by a 
link off the rocking lever. A cavity in this plug measures out 
a charge of oil at each vibration and drops it upon a heated 
