715 
The Trials of Oil Engines at Cambridge. 
Messrs. Samuelson & Co , Ltd., Banbury. — Messrs. Samuel- 
son’s engine (8 brake horse-power, 167£.) embodies the Griffin 
patents. This was the only competing engine using a sprayer, 
which is illustrated in fig. 14. A central plunger is driven 
down by air pressure from a tank under the bed of the engine 
and opens the oil valve. Oil is then sucked up the diagonal 
tube by induction from the horizontal air-jet, and is driven in 
the form of a fine spray into the vaporiser. 
The air pressure is maintained at 12 to 15 lb. above the 
atmosphere, by a pump driven by an eccentric on the lay shaft. 
The vaporiser (fig. 15) is a long chamber of corrugated 
section placed at right angles to the cylinder in the bed-plate. 
It is heated by the exhaust gases which pass round it as they 
escape. The supplementary air-supply is admitted through an 
inlet valve, and, after being likewise heated by the exhaust 
gases, enters the vaporiser at the sprayer end and mixes with 
the spray. 
The governor is of the ordinary ball pattern, and when the 
