File:Mastering power production; the industrial, economic and social problems involved and their solution (1921) (14591772130).jpg

Identifier: masteringpowerpr01pola (find matches)
Title: Mastering power production ; the industrial, economic and social problems involved and their solution
Year: 1921 (1920s)
Authors: Polakov, Walter N. (Walter Nicholas), 1879-1948
Subjects: Efficiency, Industrial Power-plants
Publisher: New York, The Engineering magazine company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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ample The most primitive method of selecting coal is the com-parison of prices per ton. This is occasionally modified by legalregulations, security of deliveries, terms offered in the contract,and similar commercial considerations. Thus in New YorkCity the use of anthracite has been favored and even made obli-gatory so long as law-makers believed bituminous coal to besmoky; in Maine, Pocahontas and New River coals were invogue, even in unsuitable furnaces, since little ash may behauled over the long route; in Pennsylvania, sometimes unsuit-able coal is brought from far away mines because of a lower bidper ton on a long-term contract. In the first decade of this century the methods of buying bi-tuminous coal on a heat value basis became fashionable. Themore conspicuous of these methods were those of the UnitedStates Geological Survey, the Panama Railroad Company, the io4 Interborough Rapid Transit, City of New York (See Appendix2) and the Celluloid Company. It was as much a step in the
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10 20 30 40 Percentage of Carbon in Refuse 50 60 Fig. 33.—Relation between Ash Content and Furnace RefuseDiagram for approximate determination of furnace refuse to be expected fromcoals of different ash contents with various percentages of loss of combustible inrefuse; it may similarly serve for estimation of percentage of carbon lost in refusefrom known amount of refuse and ash content in coal. proper direction as the selection of food according to its caloricvalue though the parallel goes still further. A dietician knowsthat foods of equal heat value have different coefficients of io5 digestibility; moreover, there are proteins that stop animalgrowth while others stimulate it. While again, some nourish-ing foods are not palatable. Similarly it is not enough to knowthat a million B. t. u/s cost so much and the price may be furtheradjusted according to the variation from the normal proximateanalysis. The fitness of the coal for the furnace, service, localconditions, etc., must be ca

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