File:Railway master mechanic (microform) (1895) (14575043839).jpg

Identifier: railwaymastermec33newy (find matches)
Title: Railway master mechanic (microform)
Year: 1895 (1890s)
Authors:
Subjects: Railroads Railroads
Publisher: New York : (Simmons-Boardman Pub. Corp.)
Contributing Library: MIT Libraries
Digitizing Sponsor: Boston Library Consortium Member Libraries

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ifference in the character of coals is only partlyshown by the approximate analyses which are commonly used,but to one familiar with coals these analyses indicate in a generalway the leading characteristics of the coals. to aid combustion, but in larger amounts it retards theignition of the gases and lowers the furnace temperature.It may or may not increase the smoke, depending on thecharacter of the fuel. The percentage of ash, and especially the character ofthe ash, is of importance in connection with the smokeproblem. Ash which is fusible and runs down onto thegrate bars may cause smoke by shutting off the flow ofair through the fuel, and by increasing the poking which isnecessary to keep the grates free. Coals which clinkerbadly require more attention from the firemen and pokingthe fire is a common cause of smoke. There is a great difference in the behavior of the samecoals when burned under different furnace conditions and indifferent furnaces. Some grates and stokers are adapted
Text Appearing After Image:
Parsons Machine and Erecting Shop, M. K. & T. System. To show the difference in fuels, Table 1 has been pre-pared. It will be noted that coals vary both in their compositionand in their heating values (B.t.u.), and in consequencethey are more or less valuable as fuel, depending on thesevariations. Other things being equal, a fuel high in fixed carbon ismore easily burned in a common furnace without loss ofheat and without smoke than those of lower percentages.Coke and anthracite coals are examples of this class offuels. The percentage of moisture is not of great importanceexcept in cases in which the coal is naturally high in moist-ure, or in which the coal is very wet as a result of washingor exposure to storms. Moisture in small percentages seems *From a paper by D. T. Randall, read at the Syracuse meet-ing of the International Association for the Prevention ofSmoke, June 24 to 26, 1909. to handle coals which are burned with great difficulty onother equipment. The rate of burnin

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