Full Details

Name and Model Number Keuffel & Esser
Student Slide Rule
Model 4058
Very Early Model
Country of Origin USA
Date of Manufacture Estimate before 1906
Front Scales A B C D
Back Scales S L T
Scale Length 25 cm (10 inches)
Type of Rule Slide Rule
Construction Paper scale on Mahogany early framed cursor
Area of Use Generic
Comment Very early cursor not labeled K&E no groove for cursor fits over full thickness of wood frame.
Rarity RR
Donor Collection of Clay Castleberry
Match Number 310
(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.