736 The Trials of Oil Engines at Cambridge. 
ment is precisely like that of the fixed engine, and it is mounted 
on a three-wheeled platform of neat appearance. The clearance 
space beneath, however, is too small, and the single front wheel 
must render the engine unstable in turning a sharp corner. 
There are two flywheels, one at either end of the crank 
shaft, and the clearance in front is all that can be desired. 
Astern, however, there is little possibility of getting a lead 
clear of the wheel axles and gearing. 
Details of Portable Engines. Class II. 
Engine . . . j 
Hornsby & 
Sons, Ltd. 
Crossley 
Bros., Ltd. 
The Campbell 
Gas Engine 
Co., Ltd. 
Clarke, 
Chapman & 
Co., Ltd. 
Catalogue No. . 
5,973 
5,828 
5,764 
5,869 
Declared B.H.P. 
12| 
12 
10* 
12 
Weight in cwts. t 
(empty) . . / 
81 
62 
— 
— 
Capacity of water- ) 
tank . . ./ 
20 gallons j 
67 gallons, j 
working [ 
supply 30 [ 
gallons J 
165 gallons 
— 
Price complete 
£285 
£200 
£190 
£275 
Over-all dimensions j 
13 ft. G in. x 
5 ft. 8 in. 
12 ft. 9 in. x 
6 ft. 3 in. 
12 ft. 6 in. x 
6 ft. 3 in. 
11 ft. X 
6 ft. 1 in. 
Diameter of cylin- "1 
der, inches ./ 
12 
h|« 
00 

10£ 
Stroke, inches . 
16 
18 
16 
16 
Diameter of flywheel 
5 ft. 
2 of 5 ft. 
4 ft. 6 in. 
2 of 5 ft. 
Width of flywheel, y 
inches . . J 
G 
5 
«* 
G 
Revolutions per j 
min. declared . j 
200 
210 
180 
230 
The oil- and water-tanks are arranged below the platform, the 
water-tank being capable of holding about 60 gallons. A draught 
of air is maintained through the water so as to cool it, and does 
this so efficiently that during the trials the maximum tempera- 
ture of the jacket water was below 1 20° Fakr. The total weight 
of the engine is 62 cwts. empty, its breadth over all being 6 ft. 
