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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.