[Slide Rule]. Pickworth, Charles N. - INSTRUCTIONS For The USE Of A. W. FABER'S IMPROVED CALCULATING RULE

New York: A. W. Faber, (n. d.). Ca early 1900s. Red cloth spine with stiff grey paper-stock covers. 47 pp of explanatory text. 55 diagrams, on 14 fold-out sheets at rear, illustrating slide-rule usage. 8vo. 24 cm x 16.5 cm. VG (some minor soiling & thumbing to covers).

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