Full Details

Name and Model Number Tavernier- Gravet with reverse E chisel cursor
Country of Origin France
Date of Manufacture 1885-1895
Front Scales A B C D note the railroad track scale layout.
Back Scales S plus two unmarked scales believed to be L and T
Scale Length 25 cm (10 inches)
Type of Rule Slide Rule
Construction Celluloid on boxwood with brass reverse E chisel cursor
Area of Use Generic
Comment Note two cursors, one is original and one I had manufactured.
Rarity RR-RRR
Donor Collection of Clay Castleberry
Match Number 315
(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.