Full Details

Name and Model Number Keuffel & Esser 4082-3
“Radio” Slide Rule
Country of Origin USA
Date of Manufacture Pre 1940
Front Scales L LL1 DF [CF CIF CI C] D LL3 LL2
Back Scales LL0 LL00 A [B T ST S] D DI F
Scale Length 25 cm
Type of Rule Slide Rule
Construction Duplex mahogany body with celluloid laminate scale surfaces.
Area of Use Generic
Comment This rule does not appear in the catalogs. The rule is a precursor to later rules tailored for electronics. The F scale is 1/2pi
Rarity RRR
Donor Collection of Clark McCoy
Match Number 220
(Click Picture for Details)

In conjunction with our 'donors' we assign a rarity rating to each item, based on the system devised by Herman van Herwijnen
(1929 - 2004), renowned Dutch collector, author, and creator of Herman's Archive, a collection of 5,000 slide rule images on CD.
• RR = Rare - 1 of 25 collectors has one; it may take a year to find an example in the marketplace.
• RRR = Very Rare - only a few known to collectors; may be several years before it comes up for sale.
• RRRR = Extremely Rare - a museum piece; unlikely that an example will come up for sale.