|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.
|Donor||Collection of Gary Flom|
(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.|