| Name and Model Number | Eureka (made by Kratz-Boussac) |
| Country of Origin | France |
| Date of Manufacture | 1892 |
| Capacity | |
| Construction | Cardboard and nickeled metal |
| Area of Use | Education |
| Comment | Capacity Simple calculations : addition and subtraction (with the central disc),
multiplication and division (with mechanical index) The backround chromolithograph (as Mucha) is superb. |
| Rarity | RRRR |
| Donor | Collection of French gentleman |
| Match Number | 403 |
| 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. |