NO. 6 E T LOCOMOTIVE BRAKE 



251 



brake. Fig. 1 shows the dividing line between the distribu- 

 ting valve and its double-chamber reservoir. The distributing 

 valve (the piece to the left) is directly connected to the double- 

 chamber reservoir, and all the pipe connections, of which there 

 are five, are made to the reservoir so that the distributing 

 valve can be separated from its double-chamber reservoir 

 without disturbing any of the pipe connections. 



Fig. 2 is a side view of the double-chamber reservoir sec- 

 tioned in such a manner as to show the partition between 

 the pressure chamber and the application chamber, as well as 

 the relative sizes of these chambers. This view also shows the 



FIG. 2 



ports MR, BP, and o, and' the core and drain plugs. The 

 pressure chamber represents an auxiliary reservoir, and the 

 application chamber, combined with the application cylinder 

 of the distributing valve, represents a brake cylinder. These 

 chambers have the relative proportions to each other of an 

 auxiliary reservoir and its proper brake cylinder with 8 in. 

 of piston travel; thus, when the pressure chamber is charged 

 with air at 70 Ib. per sq. in., the same as that in the brake 

 pipe and auxiliaries on the train, the volume of air therein 

 will equalize in both chambers at 50 Ib., and in that propor- 

 tion at every other auxiliary-reservoir pressure. The volume 



