288 
TRACTION OP WHEELS AND AXLES. 
II .—Results of Experiments on Lubrication. 
Amount, 
in ozs., of grease expended. 
Nature 
of wheel 
and 
axle. 
On completing 80 miles. 
On completing 
160 miles. 
Heating, &c. 
Run out 
at face. 
Run out 
at back. 
Used. 
Total 
spent. 
Total spent. 
A 
•25 
•80 
1-25 
2*30 
3-50 
Nave and arm cool throughout, 
f Nave and arm cool through first 
B 
•25 
•50 
•50 
1-25 
2-25 
< 80 miles, slightly warm through 
(. second 80, but not increasing. 
r Heated gradually, till towards 
C 
2-50 
*50 
1-50 
4*50 
3 close of first 80 miles so hot 
1 that the grease burnt, and the 
(.runninghad to be discontinued. 
Examining the above table, we see the results are in favour of the 
modified service wheel and axle, in addition to which it is to be 
remembered that this wheel has capacity for 13ozs., while the others 
can hold but 6 J ozs. The latter amount was put in each wheel previous 
to starting, in A and C in the grease recess, and in B in the additional 
chamber in the flange, without removing it from the axle-arm. 
From this experiment we may fairly conclude that the service field 
wheel of the latest pattern—apart from any question of further improve¬ 
ment—is a satisfactory wheel, and not liable to fire, if only reasonable 
attention be given to its lubrication. 
Septembek, 1877. 
