Full Details

Name and Model Number Gravet-Lenoir (Soho)
Règles à Calculer
Country of Origin France
Date of Manufacture c. 1867 to 1881
Front Scales A [ B B ] D, Back of slide S, L, T
Back Scales Tables, beveled edge - none
Scale Length 25-cm
Type of Rule Slide Rule
Construction Soho scale set, Closed frame boxwood; no laminate. No beveled edge. No cursor needed.
Area of Use Generic
Comment Marked "GRAVET LENOIR " & "TAVERNIER-GRAVET SUCCR "394 RUE DE BABYLONE, PARIS". Address & maker date this slide rule to 1867 to 1881.
Rarity RR-RRR
Donor Collection of Ed Chamberlain
Match Number 155
(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.