Full Details

Name and Model Number Gilson Atlas
Type I Version II
Country of Origin USA, Niles, Michigan
Date of Manufacture Before 1927
Front Scales One circular and one 30-revolution C scales
Back Scales None
Scale Length 30 in. circular and 46 ft. spiral
Type of Rule Disc
Construction Square aluminum plate with white painted surface
Area of Use Generic
Rarity RRR
Donor Photo from a collection in MA, USA
Match Number 166
(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.