TOOIAN.- ELECTROMOTIVE FORCE PRODUCED IN SOLUTIONS. 119 



with a vertical shaft and was placed in a specially constructed pit 

 The vertical shaft necessitated the design of some form of thrust 

 bearing to support the rotating system. 



Figure 2. The Thrust Bearing, h size. 



The Thrust Bearing. 



The thrust bearing used was contained in the case K, Figure 1. 

 The details are shown in Figure 2. It consists of a series of five ball 

 bearings, placed one above the other, so as to distribute the total rela- 

 tive motion which must be cared for. Each ball bearing consists of a 

 series of balls F, in a brass cage, between two hardened steel washers. 

 A shoulder on the shaft D rests on the topmost washer E, and the 

 lowest bearing rests on the levelling washer G, which has a spherical 



