. Science of railways . f dropping main wheels at enginehouses, keeping engine in service until ready for shop. Keeps crank pin bearings in better shape during thisperiod. Lessens failures of frames, axles and other parts due toshocks resulting from looseness in main bearings. Makes a better riding engine, which means less deteriora-tion to entire machine. Permits of use of removable or slip bearings in other driv-ing boxes, as the long box will remain closely fitted, and thispermits of a floating bearing on other journals. Vertical load equally distributed over area 50% greaterthan standard b
. Science of railways . f dropping main wheels at enginehouses, keeping engine in service until ready for shop. Keeps crank pin bearings in better shape during thisperiod. Lessens failures of frames, axles and other parts due toshocks resulting from looseness in main bearings. Makes a better riding engine, which means less deteriora-tion to entire machine. Permits of use of removable or slip bearings in other driv-ing boxes, as the long box will remain closely fitted, and thispermits of a floating bearing on other journals. Vertical load equally distributed over area 50% greaterthan standard box. 642 LOCOMOTIVE APPLIANCES. LOCOMOTIVE SMOKE ABATEMENT Although it is calculated by competent authority that onlythirteen per cent of the smoke in the city of Chicago, thelargest railroad center in the world, is caused by steam loco-motives, still the agitation against the emission of smoke andcinders from locomotives has been so pronounced in most citiesthat it should prove interesting to know of the following thor-. Engine 7042 in Plate on Testing Plant ough test made at the Altoona Locomotive Testing Plant ofthe Pennsylvania Railroad Company under the direction of acommittee of the General Managers Association of Chicago. These smoke-abatement tests were made to determine themerits and proper application of steam jet combustion tubesin a locomotive fire-box for abating smoke, both with and with-out a brick arch, the special purpose being the development ofa specification applicable to locomotives operating in the cityof Chicago. LOCOMOTIVE APPLIANCES. 643 In brief, the results show that if from four to six pounds ofair per pound of coal fired is delivered over the fire by steamjet tubes, the emission of smoke will be reduced to a very lowamount, and that while the brick arch is a benefit, particularlywhile the locomotive is running, the steam jet combustion tubeis of value either with or without a brick arch. Description of Locomotive and Test Apparatus:—Loco
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