216 PROFESSOR 0. REYNOLDS OX THE THEORY OF LUBRICATION 
From Mr. Tower’s 1st Report, Brass No. 1. 
Table IX. Bath of Lard Oil. Variation of Friction with Temperature. Nominal 
Load 100 lbs. per square inch. 
Nomina' 
friction per sq tare inch of bearing. 
Temperature. 
i'ahr. 
100 rev. 
150 rev. 
200 rev. 
250 rev. 
300 rev. 
3f0 rev. 
400 rev. 
450 rev. 
per min. 
per min. 
per min. 
per min. 
per min. 
per miu. 
per min. 
per min. 
120 
•24 
•29 
•35 
•40 
•44 
•47 
•51 
•54 
110 
•26 
•39 
•44 
•50 
’55 
•59 
*64 
100 
•29 
•37 
•45 
•51 
•58 
•65 
•71 
•77 
90 
•34 
•43 
•52 
■60 
•69 
•77 
•85 
•93 
80 
•4 
•52 
•63 
•73 
•83 
•93 
1-02 
1-12 
70 
•48 
■65 
•8 
•92 
1-03 
1-15 
1-24 
1-33 
60 
•59 
•84 
1-03 
119 
1-30 
1-4 
1-48 
T56 
From Mr. Tower’s Second Report, Brass No. 2. Heavy Mineral Oil. Nominal Load 
333 lbs. per square inch. Number of revolutions 150 per minute. Temperature, 90°. 
Table XII. Oil pressure at 
differents points of a 
bear in o\ 
O 
Longitudinal planes 
on 
centre 
off 
Pressure per square inch . 
, . lb. 
lb. 
lb. 
Transverse plane, middle. 
. . 370 
625 
500 
Transverse plane, No. I , 
. . 355 
615 
485 
Transverse plane, No. 2 . 
. , 310 
565 
430 
The points at which the pressure was measured were at the intersections of six 
planes, three parallel vertical longitudinal planes parallel to the axis of the journal, 
one through the axis, and the other two, one on the on and the other on the off side, 
both of them at a distance of •975 inch from that through the axis, three transverse 
planes, one in the middle of the journal, the other two respectively at a distance of 
one and two inches on the same side of that through the middle. 
In referring to these experimental results in the subsequent articles, 
The nominal load per square inch is expressed by L' \ 
The number of revolutions per minute by N'; 
The nominal friction by f ; 
The effect of the fall of pressure at the ends of the journal on the mean pressure 
is expressed by-, thus—■ 
