Full Details

Name and Model Number Keuffel & Esser 1746 1/2
Country of Origin Germany for K&E ?
Date of Manufacture 1897 to 1901
Front Scales A [ B C ] D
Back Scales none
Scale Length 25 cm
Type of Rule Slide Rule
Construction Closed frame boxwood; celluloid laminate. With beveled edge. Metal frame glass window cursor.
Area of Use Generic
Comment No model number given.
Ladder scales and boxwood frame with no adjustment indicates pre-1900 and the probability that this slide rule was made in Europe.
1897 & 1899 catalogs carry a Model #1746 that fits the description of this example. Also came with brass chisel cursor as Model #1746.

Rarity RR
Donor Collection of Ed Chamberlain
Match Number 130
(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.