. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . us boiler-tubes into the smoke-box S and out throughthe smoke-stack. The fire-box consists of an inner and outershell separated by a layer of water 3 to 5 thick. The ex-posure of water-surface to the influence of the fire is thus verycomplete. The efficiency of this transferal of heat is somewhatindicated by the fact that, although the temperature of thegases in the fire-box is probably from 3000° to 4000° F., thetemperature in the- smoke-box is generally reduced to 500° to600°
. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . us boiler-tubes into the smoke-box S and out throughthe smoke-stack. The fire-box consists of an inner and outershell separated by a layer of water 3 to 5 thick. The ex-posure of water-surface to the influence of the fire is thus verycomplete. The efficiency of this transferal of heat is somewhatindicated by the fact that, although the temperature of thegases in the fire-box is probably from 3000° to 4000° F., thetemperature in the- smoke-box is generally reduced to 500° to600° F. If the steam pressure is 180 lbs., the temperature ofthe water is about 380° F., and, considering that heat will notpass from the gas to the water unless the gas is hotter than thewater, the water evidently absorbs a large part of the theo-retical maximum. Nevertheless gases at a temperature of I §403. ROLLING-STOCK, 435 600° F. pass out of the smoke-stack and such heat is utterlywasted. The tubes vary from If to 2, inside diameter, with a thick-ness of about OMO to The aggregate cross-sectional. Fig. 188.—Locomotive-boiler. area of the tubes should be about one-eighth of the grate number will vary from 140 to 375. The length varies from11 to 21, but the length is virtually determined by the type andlength of engine. 403. Fire-box. The fire-box is surrounded by water on thefour sides and the top, but since the water is subjected to the
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