Full Details

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
(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.