bituminous coal

Size Sieve sizes Use
Run of mine goes through 8-inch holes  
Lump goes through 5-inch holes hand firing and domestic purposes
Egg goes through 5-inch holes, retained by 2-inch round holes hand firing, gas producers, domestic firing
Nut through 2-inch holes,
retained by 1¼-inch holes
small industrial stokers, gas producers, hand firing
Stoker coal through 1¼-inch holes,
retained by ¾-inch holes
small industrial stokers, domestic firing
Slack ¾ inch and under pulverizers and industrial stokers

U. S. Dept. of Energy, Energy Information Administration.
Coal Data: A Reference.
Washington, DC: U.S.G.P.O., 1982.

Page 60.

Steam. Its Generation and Use. 37th edition.
New York: The Babcock and Wilcox Co., 1955.

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