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file U (Stack)Thacher, Edwin
"The Slide Rule"
reprint from Transactions | Engineers' Society of Western Pennsylvania, vol. I, 1880-1882 (1882), pp. 289-310. Facsimile reprint published by the Oughtred Society, issued with Journal of the Oughtred Society, vol. 4 no. 1, 1995. Brief introduction by Bob Otnes.
[1995-37/part]
1995