AIR STRAINERS 371 



matter drop to the bottom of the chamber and can be quickly 

 removed without disturbing any pipe connections. A good 

 idea of the internal construction and the operation of the 

 centrifugal dirt collector can be obtained from the horizontal 

 section shown in Fig. 2. Air from the brake pipe, on its way 

 to the triple valve, enters at A, passes through the passage c t 

 into the chamber E, thence up passage /, and out at B. The 

 air on its way through the passage c receives a whirling motion 

 when it enters chamber E, which tends to cause any foreign 

 matter in the air to be carried close to the walls of the chamber. 

 Then, as the air is compelled to rise in order to escape through 

 passage /, the foreign matter drops to the bottom of the collector 

 whence it can be removed by unscrewing the special plug 3. 

 In Fig. 3 is shown the application of centrifugal dirt collector 

 to a car. 



AIR STRAINERS 



BRAKE-PIPE STRAINERS 



Two sizes of brake-pipe strainers, shown in Fig. 1, are made. 

 The 1-in. strainer was formerly furnished with locomotive and 

 passenger-car brake equip- 

 ments. The IJ-in. was for- 

 merly furnished with freight-car 

 brake equipments, also with 

 locomotive - brake equipments 

 when li-in. brake pipe was spe- 

 cified. 



To meet special conditions, 

 a pattern is provided for a 1 1" 

 X1J"X}" brake-pipe strainer, 

 Piece No. 6,141, to avoid the 



cumbersome appearance of the standard IJ-in. strainer, Piece 

 No. 2,151, if bushed. Piece No. 6,141 will be made up and sup- 

 plied only as ordered and can be furnished with J-in. side open- 

 ing bushed to Hn. (Piece No. 6,145) or to i-in. (Piece No. 

 11,496) if desired. Repair parts for these special strainers are 

 the same as for the standard, except body, Piece No. 6,142, for 



