711 
The Trial* of Oil Engines at Cambridge. 
On the trials the lamp burned very badly, and it was 
impossible to keep the vaporiser hot enough. The diagrams 
obtained were, consequently, late in ignition, and the oil con- 
sumption was considerably higher than that of the other engines. 
There is little doubt that this defect could be easily cured and 
that the engine is a good one, but it was withdrawn from trial 
after the half-power run. It ran very steadily during the three 
days’ trial, and required little attention, starting readily with 
one attendant only after about twenty-two minutes’ warming up. 
Messrs. Tolch rf- Co., 146 Clerkenwell Hoad, London, E.C. — 
Fifi. 11. — Glycerin pump of Tolch & Co.'s “Capitaine” Engine. 
a. Slide valve. B. Pump plunger. 
Messrs. Tolch & Co. entered a vertical engine on the “ Capi- 
taine” principle. It is of 5 brake horse-power and costs 118/. 
It does not use water-circulating tanks. 
The distinguishing features are a small conical vaporiser 
encased in non-conducting material and placed within the ex- 
plosion chamber, and a very ingenious oil distribution by a slide 
valve and glycerin pump (fig. 11). 
At each alternate stroke of an ordinary plunger pump the 
slide valve opens communication to suction or discharge. The 
pump chamber is partially filled with glycerin, upon which the 
oil floats so that the supply is uniform and very easily regulated. 
