|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.
|Donor||Photo from a collection in Belgium|
(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.|