228 
PROFESSOR 0. REYNOLDS ON THE THEORY OF LUBRICATION 
Tabular. 
c. 
Tabular. 
1-505 /,'. 
Experimental. 
f 
Difference. 
•578 
•36 
•57 
•58 
•01 
•520 
•414 
•656 
’65 
- 005 
•520 
•314 
•498 
•472 
-•026 
•510 
•249 
•394 
It thus appears that the approximation is very close, the calculated values for the 
first, in which c is greater than ’540, being too small, and for the rest, in which c was 
smaller than ‘540, too large, which is exactly what was to be expected. 
These corrected values of f{ have been introduced in Table IV. in brackets. As 
they occur with different loads and different velocities, they afford a very severe test 
of the correctness of the conclusions arrived at as to the variations of A and T with 
the load and temperature, also as to the condition expressed by n. Had the values of 
c and f been completely calculated as for the case of c='5, there would have been 
close agreement for all the calculated and experimental values of f. 
This close agreement strongly implies, what was hardly to be expected, namely, that 
the surfaces, in altering their form under increasing loads, preserve their circular 
shape so exactly that the thickness of the oil film is everywhere approximately 
a(l+c sin (6 — <£)). 
A still more severe test of this is, however, furnished by the pressure experiments 
with brass No. 2 in Mr. Tower’s second report. 
41. The Velocity of Maximum Carrying Power. 
The limits to the carrying powers are not very clearly brought out in these recorded 
experiments of Mr. Tower, as indeed it was impossible they should be, as each time 
the limit is reached the brass and journal require refitting. But it appears from 
Table I. and all the similar tables with the oil bath in Mr. Tower’s reports, that the 
limit was not reached in any case in which the load and velocity were such as to make 
c less than *5. In many cases they were such as to make c considerably greater than 
this, but in such cases there seems to have been occasional seizing. There seems, 
however, to have been one exception to this case, in which the journal was run at 
20 revolutions per minute with a nominal load of 443 lbs. per square inch with brass 
No. 2 without seizing, in which case c, as determined either by the friction or load, 
becomes nearly - 9. 
It does not appear that any case is mentioned of seizing having occurred at high 
speeds, so that the experiments show no evidence of a maximum carrying power at a 
particular velocity. 
