Price list J: material for mills, power plants and water works (1911)
George E. Gilchrist Co. · George E. Gilchrist Co. · leaf 45
tor lignite fuels, because theirheat-making values differ sowidely. One cubic foot ofhard coal weighs aboutfifty pounds, while a cubicfoot of soft coal weighsabout forty pounds. Con-sequently any soft coalhaving a heat-making valueequal to hard coal requiresa Boiler with twenty-fiveper cent more… … Caking soft coals have amuch higher heating powerthan^ coals which are freeburning or non-caking. The^ ratings provide thatall piping, in addition to thedirect radiation to be used,shall be figured as radiatingsurface in estimating the sizeof the boiler required. These ratings are fordirect…
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