AND ITS APPLICATION TO MR. B. TOWER’S EXPERIMENTS. 
179 
velocity, while the theoretical conclusion that the friction, with any particular load 
and speed, will depend on the supply of oil in the pad, is in strict accordance with 
Mr. Tower’s conclusion, and with the general disagreement of the coefficients of 
friction determined in different experiments. 
17a. The Conditions of Equilibrium with Cylindrical Surfaces. 
So far CB has been considered as a flat surface, in which case the equilibrium of 
CB requires that it should be so far constrained by external forces that it cannot 
either change its direction or move horizontally. 
When AB is a portion of a cylindrical surface, having its axis parallel to that of 
AB, the only condition of constraint necessary for equilibrium is that CB shall not 
turn about its axis. This will appear on consideration of the following cases :— 
Case 8. Surfaces Cylindrical and the Supply of Oil Limited. —Fig. 13 shows the 
surfaces AB and Cl) 
Fig. 13. 
J is the axis of the journal AB. 
I is the axis of the brass CD. 
JL is the line in which the load acts. 
O is the point in which JL meets AB. 
B=JP. 
Pt-b« = IQ. 
/^=PQ. 
A 0 =HG. 
The condition for the equilibrium of I is that the resultant of the oil pressure on 
BC together with friction shall be in the direction OL, and the magnitude of this 
resultant shall be equal to the load. 
2 a 2 
