Keuffel & Esser 4081-3  
Written by Accutron on 2017-07-05  

Introduced in 1937, the Keuffel & Esser 4081-3 is a log log duplex 'Decitrig' slide rule with 10" scales. Instead of being divided into degrees and minutes, the trigonometric scales of the 4081-3 are divided into degrees with decimal graduations. The 4081-3 was manufactured for over 35 years, with numerous scale revisions over its production lifespan. The example pictured here has 23 scales, and was manufactured after 1954. Like most K&E slide rules, the 4081-3 has a mahogany body laminated with engraved celluloid.

Available Scales: LL02 LL03 DF [CF CIF CI C] D LL3 LL2 ||| LL01 L K A [B T Cot SRT S Cos] D DI LL1

Keuffel & Esser 4081-3 simulation, adapted from the Virtual Slide Rule script by Derek Ross. Click stator to reverse.

Keuffel & Esser 4081-3 log log duplex 'Decitrig' slide rule, obverse view.

4081-3 slide rule, reverse view.

4081-3 slide rule, box and carrying case.

This article is part of the [Slide Rules] exhibit.

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