. American engineer and railroad journal . nexpensive to maintain. They must dis-tribute the load in such a way as to reduce to the minimumthe vertical stresses in the frames, and they must provide forwear to be received upon parts which may be easily renewed and they should not only support the boiler, but hold it againstsurging stresses and provide for tensile stresses due to hand-ling the engine in a wreck. The best opinion seems to favor support from the mud ringand doing this with a view of keeping all attachments asclose to the firebox as possible, making provisions for distrib-uting the
. American engineer and railroad journal . nexpensive to maintain. They must dis-tribute the load in such a way as to reduce to the minimumthe vertical stresses in the frames, and they must provide forwear to be received upon parts which may be easily renewed and they should not only support the boiler, but hold it againstsurging stresses and provide for tensile stresses due to hand-ling the engine in a wreck. The best opinion seems to favor support from the mud ringand doing this with a view of keeping all attachments asclose to the firebox as possible, making provisions for distrib-uting the stresses over large areas. It is impossible to laydown rules for this detail because of the variety of conditionsmet in the design of locomotives of different types and for different purposes. Support by link method which has held a prominent place for anumber of years, is not now generally favored because of thedifficulties in maintenance. This is the lightest arrangement March, 1900. AMERICAN ENGINEER AND RAILROAD JOURNAL. 77. used and it has an advantage in being equally effective intension and compression, and in a wreck or derailment thisfeature is valuable. The link has fallen into disrepute insome cases because of faulty design, but even when well de-signed and with very strong pins the bearing surfaces to receivethe wear are not as large as may be desired. The pins mustbe long if the links are wide, and this sets up severe bendingstresses in the sheets on account of the overhang or leverage. Several designs are shown. The Schenectady LocomotiveWorks link plan is shown in Fig. 1, and Pig. 1 A, the RichmondLocomotive Works in Fig. 2, and a design elaborate in detail,for the Austrian State Railways, in Fig. 3. The method of sup-porting the boiler direct to the equalizer by means of a strutbetween the bars of the frames is shown in the Schenectadydesign. The Austrian links have hardened pins and bushingsand are provided with oil cups. This design may be criticise
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