This section is from "The American Cyclopaedia", by George Ripley And Charles A. Dana. Also available from Amazon: The New American Cyclopędia. 16 volumes complete..
Bushel, an English measure of 8 gallons, divided into 4 pecks, used for dry materials, as grain, fruit, coal, etc. The gallon, which by act of parliament of George IV., c. 74, § 7, is defined to determine its capacity, must contain 10 lbs. avoirdupois of distilled water, weighed in air at a temperature of 62° F., the barometer being at 30 inches; or in bulk 277.274 cubic inches. The so-called imperial bushel, then, must contain 2,218.192 cubic inches. But if the goods measured are of a kind usually heaped, as potatoes, coal, etc, it was prescribed that the capacity, including the raised cone, should be 2,815 cubic inches. This rule was abolished by act of parliament of William IV. The Winchester bushel was the standard before the imperial from the time of Henry VII. (act of 1497). Its capacity was 2,150.42 cubic inches; its dimensions 18 1/2 inches internal diameter, and depth 8 inches. Heaped, the cone was to be not less than 6 inches high, making with a true cone its contents 2,747.70 cubic inches. - The bushel of the state of New York contains 80 lbs. of pure water at its maximum density, or 2,211.84 cubic inches.