Cylindrical Slide Rule
Sept. 11, 2024
Loga-Calculator Cylindrical Slide Rule | Smithsonian Institution Thacher's cylindrical slide rule Cylindrical Slide Rules Cylindrical Slide Rule
Sept. 11, 2024
Loga-Calculator Cylindrical Slide Rule | Smithsonian Institution Thacher's cylindrical slide rule Cylindrical Slide Rules Cylindrical Slide Rule