Full Details

Name and Model Number Charpentier Calculimetre
Country of Origin France
Date of Manufacture c. 1895 - 1930
Front Scales C, D, folded square root
Back Scales Log, sin, tan
Scale Length About 19 cm
Type of Rule Disc
Construction All metal circular slide rule.
Area of Use Generic
Comment 6 cm (about 2 3/8") diameter. Sold by K&E as model 1743 and 4020. Also sold by Dietzgen as model 1796. Price was $5.00.
Rarity RR-RRR
Donor Collection of Clark McCoy
Match Number 207
(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.