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
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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.