| 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 |
| Comment | |
| Rarity | RRR |
| Donor | Photo from a collection in MA, USA |
| Match Number | 166 |
| Thumbnail (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. |