Full Details

Name and Model Number Tavernier-Gravet 50 cm
Règle à Calculer
with Chisel Cursor
Country of Origin France
Date of Manufacture c. 1867 - 1872
Front Scales A [ B C ] D
Back Scales [ S L T ]
Scale Length 50 cm Mannheim
Type of Rule Slide Rule
Construction Closed frame boxwood; no laminate. No beveled edge. Chisel cursor with open window. In mahogany wood box with hinged lid.
Area of Use Generic
Comment Marked "TAVERNIER-GRAVET SUCCR, 39 RUE DE BABYLONE, PARIS". Address and maker dates this slide rule to 1867 to 1872.
Rarity RRR
Donor Collection of Ed Chamberlain
Match Number 191
(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.