Full Details

Name and Model Number Keuffel and Esser 4053
Classroom Model
Country of Origin USA
Date of Manufacture 1930 - 1940s
Front Scales A B CI C D K
Back Scales None
Scale Length 244 cm (8 Feet)
Type of Rule Slide Rule
Construction Light colored wood cursor by Bob Otnes
Area of Use Generic
Comment Used for slide rule instruction - just like we had in class many years ago
Rarity RR
Donor Collection of Clay Castleberry
Match Number 322
(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.