Full Details

Name and Model Number Keuffel & Esser 4088-3
25 cm Scales, Column Cursor
Country of Origin USA
Date of Manufacture 1913
Front Scales DF [ CF CIF C ] D
Back Scales K A [ S T CI ] D L
Scale Length 25 cm
Type of Rule Slide Rule
Construction Celluloid on mahogany
Area of Use Generic
Comment Previous owner: D.H. Wilson, Class of 1916, Stanford University
Rarity RRR
Donor Collection of Clay Castleberry
Match Number 261
(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.