Full Details

Name and Model Number Stadia Computer
by C-Thru Ruler Company
Country of Origin USA
Date of Manufacture unknown
Front Scales Stadia computing scales
Back Scales none
Scale Length 4.7" diameter
Type of Rule Disc
Construction Plastic
Area of Use Topography
Comment Cox and Gurley patents and copyrights must have expired before this rule was made.
Rarity RR
Donor Collection of Clay Castleberry
Match Number 268
(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.