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An English unit of capacity = ¼ cup. 
In colonial America, a jack was a mug or pitcher made of leather and waterproofed with wax or tar, of no certain volume.
Richard M. Lederer, Jr.
Colonial American English. A Glossary.
Essex, Connecticut: A Verbatim Book, 1985.
Page 123.
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Last revised: 15 February 2001.