| Name and Model Number | J.D. Barbotheu 403 |
| Country of Origin | France |
| Date of Manufacture | 1925? |
| Front Scales | DIF[CI B C]DF KF |
| Back Scales | S L T |
| Scale Length | 25 cm |
| Type of Rule | Slide Rule |
| Construction | Celluloid on wood. Fitted with three adjusting screws. |
| Area of Use | Generic |
| Comment | The glass of the cursor is missing. There is a small number 25 stamped on the back, it might be the year of production.
Look at the very peculiar scales set, including a folded scale K ! The company Barbotheu was founded by Georges Barbotheu (1857-1925) in 1885. This French precision instruments maker was established in Paris. Two addresses are known: rue Saint Gilles and rue Béranger. They had a factory rue de la Jarry in Vincennes. They were active at least until 1938 (listed in a direcory of French companies). Some of the slide rules bearing this brand might have been actually produced by Tavernier-Gravet. |
| Rarity | RR-RRR |
| Donor | Photo from a collection in Belgium |
| Match Number | 360 |
| 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. |