. Science of railways . icient air pressure usually results inserious delays to trains, as well as rendering theiroperation less safe. Air pumps are one of the hardest things to packwell with fibrous packing, and yet one of the easiest topack with metallic packing. Several large railroadsuse shot and graphite, which in time hardens into astate similar to babbitt packing; many other railroadsuse a metaUic packing of their own design; hence itwill suffice to here show the two forms of metallic airpump packing most frequently used when purchasedfrom manufacturers. UNITED STATES AIR PUMP PACKING.
. Science of railways . icient air pressure usually results inserious delays to trains, as well as rendering theiroperation less safe. Air pumps are one of the hardest things to packwell with fibrous packing, and yet one of the easiest topack with metallic packing. Several large railroadsuse shot and graphite, which in time hardens into astate similar to babbitt packing; many other railroadsuse a metaUic packing of their own design; hence itwill suffice to here show the two forms of metallic airpump packing most frequently used when purchasedfrom manufacturers. UNITED STATES AIR PUMP PACKING. This form of packing is shown in Fig. 1 as appliedto the regular stuffing box standard to air pumps. Itshould be noted that the cone is made enoughsmaller than the stuffing box to allow some cone also has a shoulder fitting over the stu£Sng 396 LOCOMOTIVE APPLIANCES. Box, thereby preventing tlie gland being screwed infar enough to close np the coil spring. The form of the babbitt rings is seen to be quite. Fig. States Air Pump Packing. similar to those furnished for piston rods andvalve stems by the same manufacturers. JEKOME AIK PUMP PACKING. This form of metallic air pump packing is shownin Fig. 2, which clearly illustrates its use. No air pump should be used on a locomotivewithout some form of metallic packing, as it ismuch less likely to burn out than fibrous packing,and will thus prevent many a delay or enginefailure. LOCOMOTIVE APPLIANCES. 397 c ^ mh ft I^HLild ^ M. - k ^ Fig. Air Pump SWAB HOLDERS. It should be remembered that metallic packing is ababbitted bearing and needs oil and attention just asmuch as it would if the shaft turned around.
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