| Name and Model Number | Keuffel & Esser 1746 1/2 Mannheim |
| 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 #1746½ 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 |
| 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. |