|Name and Model Number||Badalamenti's Factorization rule|
|Country of Origin||Italy|
|Date of Manufacture||Approx. 1960|
|Construction||Two-sided plastic rule with a complex reversible plastic cursor|
|Area of Use||Other|
|Comment||Finds the prime factors of any number up to 3199.
Invented by Gaetano Badalamenti.
For details see https://www.nzeldes.com/HOC/Factoring.htm
|Donor||Collection of Nathan Zeldes|
(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.|