. Science of railways . lose up along a plane parallelto the circumference of the rod, and hence the packing remainssteam tight until the segments have closed up entirely, dueto wear. After this has occurred, the packing rings shouldbe renewed. LOCOMOTIVE APPLIANCES. 389 Packing rings are sent from factory assembled, bored toexact size of rods and ready for application, no further ma-chining or work being needed. Should it be desired by the consumer to bore rings, it isnecessary to use a special chuck. To avoid the necessity of car-rying a large stock of various sizes of packings, the rings ar
. Science of railways . lose up along a plane parallelto the circumference of the rod, and hence the packing remainssteam tight until the segments have closed up entirely, dueto wear. After this has occurred, the packing rings shouldbe renewed. LOCOMOTIVE APPLIANCES. 389 Packing rings are sent from factory assembled, bored toexact size of rods and ready for application, no further ma-chining or work being needed. Should it be desired by the consumer to bore rings, it isnecessary to use a special chuck. To avoid the necessity of car-rying a large stock of various sizes of packings, the rings arecast with enough material to be bored to fit sizes within a quar-ter of an inch; for exampleâthe same size of ring can be usedfor packing rods from 2^^ inches to 3 inches in diameter, thenext size ring can be used for packing jrods from 3iV inches to31^ inches in diameter, etc. MITCHELL METALLIC PACKING All metallic packings usually pack the newly turned rod,but are apt to fail to repack the rod when worn. The effect. Fig. 1.âMitchell Metallic Piston Rod âBabbitt Segments. AâOil Cup. BâSwab Cup. CâSwab Cup Disc. DâPiston Rod Gland. EâSplit Joint Ring. FâRetaining Coil Spring. IâSupplemental SpringJâRetaining âSplit âCoil Spring. 390 LOCOMOTIVE APPLIANCES. of metallic packing on the rod is usually to wear the latter ovalmidway of its travel; hence, the necessity of having a packingcapable of conforming to any variation from an oval to a truecircle. When a rod is worn by this packing, it is claimedthat the rod can be packed as successfully with the replace-ment packing as by the original. The great problem is to successfully pack superheatedengines, especially those equipped with the Schmidt super-heaters. This packing is especially effective in packing rodsof engines equipped with Schmidt superheaters. For thispurpose the packing segments are composed of half copperand half lead and will stand 1200 degrees Fahrenheit and do t Fig. 2 Applied
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