- July 9, 2026
- July 9, 2026They consist of a fixed outer body and a central sliding strip, both with logarithmic scales. The device works by…
- July 9, 2026The product is a Keuffel Esser planimeter manufactured in 1918. Planimeters are mechanical devices used for measuring the area of…
- July 9, 2026
- July 9, 20263 3/4" diameter 1" thick
- July 9, 2026
- July 9, 2026Well we can only imagine if this student went on to created some of the most exciting engineering marvels -…
- July 9, 2026Feel free to check out more Antique & Vintage Trade, Mercantile and Other Related Items in My Ebay Antique Shop.…
- July 9, 2026This slide rule is in very good functional condition and comes from a non-smoking home. The leather case has a…
- July 9, 2026The Vintage Keuffel & Esser KE-2e Surveying Kit with Hard Case 663010 is a rare and antique piece originating from…
- July 9, 2026It is similar to the one used by Adm. Richard Byrd (currently in the Smithsonian) on his 1929 Polar Expedition…
- July 9, 2026There is a picture thru the optics showing that it has one vertical line and three horizontal lines. This picture…
