699 
The Trials of Oil Engines at Cambridge. 
has the oil consumption then recorded been lowered, but there 
were several engines which, throughout the Cambridge trials, 
kept very close to those which in the end gained the awards. 
F. S. Courtney. 
3 Whitehall Place, S.W. 
Professor Capper s Report. 
The first and second classes of Implements for which prizes 
were offered at the Cambridge Meeting were the following : — 
Class I. — Fixed Oil Engines, of 4 to 8 brake horse-power. 
First Prize, 50L Second Prize, 25Z. 
Class II. — Portable Oil Engines, of 9 to 16 brake horse- 
power. First Prize, 50L Second Prize, 25 1. 
The conditions of trial were laid down thus : — 
All the engines will be worked with the same sample of oil, which 
shall be one of the well-known brands — eg., Russolene oil — and, if considered 
desirable by the Judges, a further trial of the selected engines will be made 
with a cheaper oil selected by the exhibitor. 
The adaptability cf each engine for general purposes on a farm will be 
considered, especially as regards simplicity of design, strength, durability, 
stability, and freedom from fouling. 
The engines will have to run for three days — running at least ten hours 
per day on their declared brake-load — the petroleum and lubricating oil being 
weighed out. Each competitor will be allowed one attendant only in charge 
while the engine is running, such attendant to be under the direction of the 
Judges. At the end of the above run each engine will go — just as it stands 
— on to a full-load trial, during which indicator diagrams will be taken, 
brake-load recorded, and oil used weighed. This will be followed by a 
light and half-load trial under similar conditions. 
The attention of the Judges and Engineers will be particularly directed 
to the following points : — 
1. Simplicity, workmanship, and durability, combined with facilities for 
repairs. 
2. Economy in getting to work and attendance. 
3. Consumption of oil and circulating water. 
4. Governing power and uniformity of speed. 
5. Efficiency. 
6. Cost; — and, in Class II. (portable engines) only, the following 
additional points: 
7. Weight. 
8. Facility of transport and stability. 
9. Arrangement and capacity for carrying oil and circulating water. 
In the first class thirteen and in the second class seven 
engines were entered ; but only the fifteen engines enumerated 
in the accompanying table actually competed. 
