Three slide rule-related items. 1. The Use of the Slide Rule - 9" H, hard cover (brown cloth with gilt lettering on front board), 1915, 36 pp, + 4 pp advertising. B&w illustrations. 2. The Quick and Easy "Lawrence" Slide Rule Instruction Book - 8 1/2" H, soft cover (stapled in pictorial wraps), 1940, 28 pp. B&w illustrations. 3. The Versalog Slide Rule: An Instruction Manual - 8 1/4" H, hard cover (gray cloth with dark blue lettering on spine and front board), 1954m 115 pp. B&w illustrations. 1. Light toning to pages and endpapers, light wrinkling on the spine, a few light rub marks on the... View More...