Full Details

Name and Model Number Ricoh 159
Country of Origin Japan
Date of Manufacture 1965
Front Scales LL/1 LL/2 LL/3 A [ B BI K CI C ] D LL3 LL2 LL1
Back Scales Sh1 Sh2 P2 P1 [Q Sr sθ Th C ] D T2 T1
Scale Length 25 cm
Type of Rule Slide Rule
Construction Body celluloid on bamboo, cursor plastic
Area of Use Electrical
Comment Considered to be one of the rarest hyperbolic slide rules by William K Robinson ( http://ww2.hyperbolicsliderules.com:8110 ).
Rarity RRR
Donor Photo courtesy of Jodie Hobson
Match Number 385
(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.