. Science of railways . Fig 2 United States Piston Rod Packing for Pistons with Ends. babbitt rings 2 are the only parts that should touch therod, so that if the rod is once trued up perfectly roundand parallel it should wear very slightly and evenly. As most modern designers make piston rods withenlarged ends, Fig. 2 will show the provisions made. LOCOMOTIVE APPLIANCES. 379 therefor, namely: the flange follower 3 and the vibrat-ing cup 6 are composed of two rings, the inside oneof which in each case is i^iade in two halves. This packing should always be lubricated by an oilcup supply
. Science of railways . Fig 2 United States Piston Rod Packing for Pistons with Ends. babbitt rings 2 are the only parts that should touch therod, so that if the rod is once trued up perfectly roundand parallel it should wear very slightly and evenly. As most modern designers make piston rods withenlarged ends, Fig. 2 will show the provisions made. LOCOMOTIVE APPLIANCES. 379 therefor, namely: the flange follower 3 and the vibrat-ing cup 6 are composed of two rings, the inside oneof which in each case is i^iade in two halves. This packing should always be lubricated by an oilcup supplying oil to aswab cup. Fig. 3 shows the Gibbsvibrating cup, designedfor engines having an en-larged end on rod. It isrecommended as an im-provement over the regu-lar vibrating cup for thispurpose. This cup hasan inner ring, in designing new work, ^.^^, ,,.^. ^^- \ ^. ^ T . ^ . \ . Gibbs Vibrating Cup for Pistons with USmg this cup, It IS Enlarged Ends. desirable to increase the diameter of stuffmg box one-half of an inch. UNITED STATES \ALVE-STEM PACKING. It will be seen by reference to Fig. 4 that this pack-ing is very similar to the piston packing of the samemanufacture. A bushing or support, 9, is placedin the stuffing box to carry the weight of the valvestem. This support wears the valve stem less thanthe neck of the cylinder head for
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