Full Details

Name and Model Number Cox's Stadia Computer
by Gurley
Country of Origin USA
Date of Manufacture Copyright by W. & L. E. Gurley, Troy, N.Y., 1899
Front Scales Stadia
Back Scales none
Scale Length 5" diameter
Type of Rule Slide Rule
Construction Cardboard rule in cloth covered folder
Area of Use Topography
Comment This was the fancy model, in clothbound folding cover with Gurley transit ad.
Date 4/6/17 written on Gurley ad by owner.
Rarity RR-RRR
Donor Collection of Clay Castleberry
Match Number 266
(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.