Full Details

Name and Model Number Keuffel & Esser
4031 or 4032
Country of Origin USA
Date of Manufacture 4031: 1903 - 1913, 4032: 1901
Front Scales 5 inch /, A [ B C ] D, | 13 cm
Back Scales [ S L T ]
Scale Length 5 in.
Type of Rule Slide Rule
Construction Celluloid on mahogany
Area of Use Generic
Comment Could be Model 4031 or Model 4032.
Magnifying cursor for Model 4031 was offered as a separate item by K&E.
Magnifying cursor was standard on Model 4032.
No model number on rule.
Rarity RR
Donor Collection of Clay Castleberry
Match Number 235
(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.