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
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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.