Full Details

Name and Model Number Keuffel & Esser
Chemical Slide Rule
Country of Origin USA
Date of Manufacture 1914
Front Scales Sought | Given C | D
Back Scales Sought | Given C | D
Scale Length 25 cm
Type of Rule Slide Rule
Construction Celluloid on mahogany
Area of Use Chemical
Comment Includes elements, oxides and acids.
Very early column cursor model
Rarity RRR
Donor Collection of Louis J. Gotlib, USA
Match Number 226
(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.