. Electric railway journal . given by abaffle carried on the front tube of the rear bank, thistube being expanded into the center drum. 3. The arrangement of the tubes circumferentiallyon the mud drum is such as to give a larger superheaterchamber than before. This permits a greater amountof superheating surface for higher superheat thanhitherto has been obtainable and also greater ease ofaccess to the superheater headers and handhole caps. 4. In stoker-fired work, except in the case of stokersof a design that permits of carrying the front boilerwall, this wall is carried on supporting members
. Electric railway journal . given by abaffle carried on the front tube of the rear bank, thistube being expanded into the center drum. 3. The arrangement of the tubes circumferentiallyon the mud drum is such as to give a larger superheaterchamber than before. This permits a greater amountof superheating surface for higher superheat thanhitherto has been obtainable and also greater ease ofaccess to the superheater headers and handhole caps. 4. In stoker-fired work, except in the case of stokersof a design that permits of carrying the front boilerwall, this wall is carried on supporting members fur-nished as part of the standard boiler equipment. Wherethis front wall is so carried a slip joint between thefront boiler wall and that portion of the wall carried onthe stoker is used. These features not only definitelyfix the responsibility of carrying the front boiler wallbut give a front wall construction that may be repairedwithout taking down the entire wall. 5. Where the size of the boiler wall is such as to make. SECTION THROUGH ONE OF THE NEVl^ CLASSES OFSTIRLING BOILERS it advisable the use of bonding tile with properly de-signed supporting members is standard constructionin the front wall. This construction, as proved in oper-ation, is successful in overcoming the tendency of thefront wall to spring inward. 6. In the earlier designs, where battery settings wereinstalled, a three-legged center support was standardin the battery wall. In the redesigned boiler the centersupport has but two vertical members, doing away withthis objection. 7. In battery settings special means of access forinspection of the inside mud drum heads is standard Inthe redesigned boiler. The studies that have led to the redesigning of theStirling boiler naturally led to a consideration 4)f thevariation between classes and sizes of boilers. This hasresulted in an entirely new classification in which thevariation between the classes and sizes is simple, logi-cal and progressive. While the purc
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