Full Details

Name and Model Number Keuffel&Esser 4093-5
Country of Origin USA
Date of Manufacture First appeared in K&E's catalog in 1930
Front Scales L LLO D DF+CF B CI C+D LL2 LL3
Back Scales Sh2 Sh1 TI S D T
Scale Length 50 cm (20 inches)
Type of Rule Slide Rule
Construction Celluloid on mahogany, framed glass cursor Note the old circular K&E logo
Area of Use Generic
Comment These rules were a precursor to the K&E 4083 vector slide rules
Rarity RRR
Donor Collection of Clay Castleberry
Match Number 337
(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.