Full Details

Name and Model Number Pickett Log Log Vector
Hyperbolic Model 4
Country of Origin USA
Date of Manufacture c. 1949
Front Scales Root scales DF CF T ST S CI C D DI root scale
Back Scales N1 1/N1 N2 1/N2 DF/m CF/m TH SH L CI C D
Scale Length 25 cm (10 inches)
Type of Rule Slide Rule
Construction Magnesium rule , aluminum end plates
Area of Use Generic
Comment I believe this is the last of the 5 magnesium rules
Rarity RR
Donor Collection of Clay Castleberry
Match Number 292
(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.