FIG. 4 A.-Triple Valve in Release Position, with Auxiliary Res FIG. 4 D.-Triple Valve in Emergency-Application Position. Copyright, 1909, by The Norman W. Henley Publishing Co. to correctly graduate the locomotive-braking power at service applications, and to so operate that the power of the locomotive brake will be proportionately the same as that of the properly working car brakes during the different grades of application. In fact, it does all that a triple valve has done, and performs other additional functions that are individual to the E-T type of brake equipment. It is necessary, therefore, to be familiar with the operation of a plain triple valve before it is possible to satisfactorily understand the distributing valve; and as the latter is as essentially the vital part of the E-T equipment as the triple valve is of the plain automatic brake, the working of a triple valve of the simplest design of construction will be exemplified, and will be followed by an ideal, or diagrammatic, illustration and explanation of the principal features of the distributing valve for comparison, and which will make it clear that the original theory of the automatic brake has not been departed from, but only strengthened. Fig. 4 A represents a triple valve with the parts in the release position, together with the auxiliary reservoir, and brake cylinder and piston; the triple valve embodies the controlling mechanism, the auxiliary reservoir is to contain the pressure ready to be used in the application of the brake, and the brake cylinder is the place where the power of the compressed air is |