Full Details


Name and Model Number Small Pocket Calculator
Country of Origin USA
Date of Manufacture c. 1918
Front Scales 6" C, S
Back Scales L, A (2 circles), ST(small angles). Edge scales: C, D
Scale Length 5.7 (14.5 cm)
Type of Rule Disc
Construction Metal
Area of Use Generic
Comment G. Small Co., Model No. 1.
Two-piece metal dials with C and D scales on edge and rotatable metal cursor with celluloid window.
Other scales on face of each dial. Dials rotate independently to align C and D scales.
Pat. Feb 12 1918 inscribed on reverse center hub.
Rarity RR-RRR
Donor Collection of Dr. Paul J. Tarantolo Jr.
Match Number 26
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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.