Full Details

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
(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.