|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|
|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 #1746½ that fits the description of this example. Also came with brass chisel cursor as Model #1746.
|Donor||Collection of Ed Chamberlain|
(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.|