Full Details

Name and Model Number Sun Hemmi S.R.
With decimal keeper cursor
Country of Origin Japan
Date of Manufacture 1925-1935
Front Scales K A B CI D D L
Back Scales S ST T on back of slider
Scale Length 25 cm (10 inches)
Type of Rule Slide Rule
Construction Celluloid on bamboo, with flat aluminum backing at back of rule
Area of Use Generic
Comment Used for general calculations. It has some unfamiliar gauge points. A very well made rule.
Rarity RR
Donor Collection of Clay Castleberry
Match Number 356
(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.