Full Details

Name and Model Number Multiplying Rods
Country of Origin Unknown, probably France
Date of Manufacture Late 1800s?
Front Scales  
Back Scales  
Scale Length  
Type of Rule Other
Construction Cardboard, wood, handwritten digits, unsigned
Area of Use Generic
Comment 11 multiplying rods system Genaille / Lucas with a never used variety of reading.
The purpose of this set is unknown.
Rarity RRRR
Donor Photo from a collection in Germany
Match Number 78
(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.