Full Details

Name and Model Number Hemmi No. 31 Pocket Rule
With Decimal Keeping Cursor
Country of Origin Japan
Date of Manufacture c. 1930s
Front Scales A [B C] D
Back Scales S L T
Scale Length 10 cm
Type of Rule Slide Rule
Construction Celluloid on bamboo
Area of Use Generic
Comment Special decimal indicating cursor.
Thin metal back holding stators in place and providing control of slide friction.
Back is pierced with the "SUN" logo flanked by sun bursts.
Decimal keeping mnemonics on top and bottom stators.
Rarity RRR
Donor Collection of Ed Chamberlain
Match Number 126
(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.