|Name and Model Number||Keuffel & Esser 1748½ |
|Country of Origin||Made by Dennert & Pape in Germany for K&E|
|Date of Manufacture||1897 to 1901|
|Front Scales||50 cm/ A [ B C ] D|
|Back Scales||S L T|
|Scale Length||50 cm|
|Type of Rule||Slide Rule|
|Construction||Closed frame mahogany; celluloid laminate. With beveled edge. Cursor missing.|
|Area of Use||Generic|
|Comment||No model number given.
Ladder scales, mahogany frame with D&P stamp in well beneath the slide indicate a date of c. 1900.
Only the K&E 1897 & 1899 catalogs carry a Model 1748½ that fits the description of this example.
Also came with brass chisel cursor as Model 1748.
|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.|