| Name and Model Number | Keuffel & Esser 1748½ Mannheim |
| 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. |
| Rarity | RR-RRR |
| Donor | Collection of Ed Chamberlain |
| Match Number | 132 |
| Thumbnail (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. |