230 
PROFESSOR 0. REYNOLDS ON THE THEORY OF LUBRICATION 
With the section at the middle of the brass the calculated and experimental results 
are shown in Table Y. 
Table V.—Comparison of Relative Pressures, calculated by Equation (107) when 
c — ' 5, with the Pressures Measured by Mr. Tower, see Table XII., Art. 34, 
Brass No. 2. 
The values of Q 
measured from middle 
of arc at which 
pressures were 
measured. 
Pressure measured 
at the middle of 
the journal. 
Table XII., Tower. 
P~Po 
— K,c 
calculated. 
Table II. 
Relative values, 
experimental. 
Relative values, 
calculated. 
— iqc. 
O / // 
-29 20 20 
500 
•7923 
•800 
•781 
639 
0 0 0 
625 
1-0150 
1-000 
1-000 
615 
29 20 20 
370 
•6609 
•592 
•651 
560 
This agreement, although not exact, is, considering the nature of the test, very close. 
The divergence seems to show that in the experiments c was somewhat more than ’5, 
but it is doubtful if the agreement would have been exact as, owing to the journal 
having been run in one direction only, it seems probable that the radius of the brass 
was probably slightly greatest on the on side. 
Deducing the value of K x c by dividing the experimental pressure by the calculated 
values of — 0 the values given in the last column are found. An alteration in the value 
KjC B 
<Y) _O') 
of c would but slightly have altered the middle value of ■— J 0 in the same direction as the 
alteration of c ; hence taking this value, and making c=' 520, as being nearer the real 
value, 
K^c— -640 . 
.... (159) 
In these experiments 
N = 150 
L'=333 . 
.... (160) 
From equation (104) 
L=-2-5504 xKc 
7=408 . 
4 
.... (161) 
therefore 
L 
S 4L' 
= 1-21 ....... 
.... (162) 
To find a 
1230 
