Vintage K&E 4081 Log Log Duplex Decitrig Slide Rule w/ Case & Manual USA

Vintage Keuffel & Esser Log Log Duplex Decitrig Slide Rule – Model 4081 Offered here is a classic K&E duplex engineering slide rule, complete with the original leather case and slide rule manual. Keuffel & Esser was the premier American manufacturer of slide rules used by engineers, architects, and scientists prior to the advent of electronic calculators. The 4081 Log Log Duplex Decitrig model is one of their most popular professional rules, featuring a large number of scales for advanced calculations including logarithmic, exponential, and trigonometric functions. This example is a 10-inch duplex rule with multiple scales, designed for engineering calculations such as powers, roots, exponentials, trigonometry, and logarithmic functions. Included • K&E Log Log Duplex Decitrig Slide Rule (Model 4081) • Original leather carrying case • Original slide rule manual booklet Construction • Mahogany body with white celluloid laminated scales • Glass cursor with metal frame • Made in U.S.A. by Keuffel & Esser Co., New York Condition Good vintage condition. • Slide moves smoothly • Cursor glass intact • Normal age wear and light discoloration • Leather case shows typical vintage wear • Manual present Please review photos for exact condition. Why collectors like this model The K&E 4081 series is widely collected and appreciated for its high-quality construction and extensive scale set used in engineering and scientific calculations. It represents the peak of pre-calculator analog computing tools. Great collectible for: • engineering history collectors • slide rule collectors • STEM decor • vintage drafting instruments • educational demonstrations Measurements Length: approx. 12.5 in overall Rule scale: 10 in Shipping Carefully packed and shipped in a box to protect the cursor.