Full Details

Name and Model Number A.G. Thornton
PIC # 172E / PC 17
Electrical Engineer's SR
Country of Origin England
Date of Manufacture 1950's
Front Scales E1 A B RCICD C D E2
Back Scales Some interior scales for Dynamo and Volts
Scale Length 25 cm (10 inches)
Type of Rule Slide Rule
Construction White plastic, metal framed glass cursor, attached metal frame magnifier
Area of Use Generic
Comment Used for electrical engineering calculations.
Rarity RRR
Donor Collection of Clay Castleberry
Match Number 353
(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.