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
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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.