192 



TRIPLE VALVES 



to give 6 Ib. pressure in the first cylinder, and 51 sec. to give 

 6 Ib. in the one-hundredth cylinder. When fully set with the 

 15-lb. reduction, the first car had 27 Ib. cylinder pressure, 

 and the last car, 21 Ib. Eight brakes failed to apply. The 

 K triple gave 6 Ib. cylinder pressure on the first car in about 

 5 sec., and on the last car in about 19 sec. All brakes applied, 

 and the reduction gave 36 Ib. in the first cylinder and 30 Ib. 

 in the last. 



^o 



6O 



70 SO 



FIG. 5 



The time required to obtain 20 Ib. brake-cylinder pressure 

 with H and K triple valves on an eighty-car train is shown 

 in Fig. 6. The curves show that the H triple required 25, 

 93, and 95 sec. to give 20 Ib. pressure in the first, fiftieth 

 and eightieth cars, respectively. The K triple required only 

 17 i, 37, and 39 sec., respectively. The K triples, therefore, 

 gave 20 Ib. brake-cylinder pressure in the last car 55J sec. 

 before the H triples did, or before 20 Ib. was obtained in the 



