Full Details

Name and Model Number Hemmi Model 22
"Two stick" Slide Rule
Country of Origin Japan
Date of Manufacture Estimated 1950-1960
Front Scales CI C D A
Back Scales None
Scale Length 20 cm (8 inches)
Type of Rule Slide Rule
Construction Celluloid on Sandlewood plastic cursor
Area of Use Generic
Comment An inexpensive student slide rule distributed in Asia only. Very elementary, but well built. See the Journal of the Oughtred Society, Vol 13, No. 2, 2004 article by this author.
Rarity RR
Donor Collection of Clay Castleberry
Match Number 320
(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.