| Name and Model Number | MADAS Calculator |
| Country of Origin | Switzerland |
| Date of Manufacture | c. 1915 |
| Capacity | 8 setting, 8 counter, 16 accumulator |
| Construction | cast iron and steel |
| Area of Use | Generic |
| Comment | MADAS is acronym for Multiplication, Automatic Division, Addition, and Subtraction.
Stepped drum mechanism with slide set. Has clip-on sheet metal cover. Weighs 35 pounds. |
| Rarity | RRR |
| Donor | Collection of Gary Flom |
| Match Number | 391 |
| 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. |