|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.
Steam. Its Generation and Use. 37th edition.
New York: The Babcock and Wilcox Co., 1955.
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Last revised: 8 November 2003.