Full Details

Name and Model Number K&E Decimal Keeping
Slide Rule Type I
Country of Origin USA
Date of Manufacture c. 1915
Front Scales A [B C ] D
Back Scales S L T, Beveled edge has inch scale, Lower edge has cm-scale, Back of Slide Rule has tables of conversion factors and constants
Scale Length 25-cm
Type of Rule Slide Rule
Construction Closed frame mahogany body with celluloid laminate scale surfaces. Frameless cursor.
Area of Use Generic
Comment This Mannheim slide rule has a decimal keeping mnemonics on right end of slide. No model number & does not appear in K&E catalogs.
Rarity RRR
Donor Collection of Ed Chamberlain
Match Number 160
(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.