. Science of railways . ept well down on the frames withoutcrowding the ash-pan, while at the same time a flre-box vol-ume, much in excess of the ordinary, is obtained. On the Mallets shown in Fig. 11 the grates are also lo-cated above the belly of the boiler. This construction allowedthe boiler to be lowered 6 or 8 in. without harm to the ash-pan, while a fire-box of exceptionally large volume and longflame-way was obtained. Where drivers of very large diameter are used, a construc-tion similar to that illustrated in Fig. 12 can be employedto good advantage. Here a fire-box of normal depth is
. Science of railways . ept well down on the frames withoutcrowding the ash-pan, while at the same time a flre-box vol-ume, much in excess of the ordinary, is obtained. On the Mallets shown in Fig. 11 the grates are also lo-cated above the belly of the boiler. This construction allowedthe boiler to be lowered 6 or 8 in. without harm to the ash-pan, while a fire-box of exceptionally large volume and longflame-way was obtained. Where drivers of very large diameter are used, a construc-tion similar to that illustrated in Fig. 12 can be employedto good advantage. Here a fire-box of normal depth is main-tained, while that part of the mud-ring around the combus-tion chamber is carried up and over the drivers, being droppedin the front center sufficiently to take care of the throat a little unusual, this fire-box construction presents nodifficulties, and no trouble has been experienced with loco-motives so equipped. It will be noticed that the front of the mud-ring is directly 728 LOCOMOTIVE SSo . -M TO 03 CO ^ c ft > d oEooo LOCOMOTIVE APPLIANCES. 72d
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