Image from page 127 of "Pacific service magazine" (1912)
Title: Pacific service magazine
Authors: Pacific Gas and Electric Company
Contributing Library: San Francisco Public Library
Digitizing Sponsor: San Francisco Public Library
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There are many kinds of boilers in use,but the commoner ones may be dividedinto two classes, according to the locationof the fire. They are called externallyfired if the combustion of the fuel iseffected entirely or mainly outside of theboiler, and they are called internally firedif the combustion occurs in such a waythat the fuel bed of the furnace is largelyor completely enclosed or surrounded bythe boiler itself. Most of our companys boilers are ex-ternally fired and they can be dividedinto two classes, the fire tube and thewater tube. In the fire tube or returntubular boiler, as shown in Fig. 10, theboiler is within a brick setting and thefire is beneath the boiler, and the prod-ucts of combustion pass over a bridgewall to the back of theboiler and return throughlire tubes through the boilerand pass out and up thestack. This type of boilerhas been in use for manyyears and for all-aroundgeneral purposes is, if wellbuilt and enclosed in a sub-stantial, tight brick setting,a very goo
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