Full Details


Name and Model Number John I Easterly
Rafter Framer
S.R. Model 1
Country of Origin USA
Date of Manufacture 1940
Front Scales Rafter Framing calculation scales
Back Scales Insructions
Scale Length 25 cm (10 inches)
Type of Rule Slide Rule
Construction Brass brackets paint on Mahogany frame scales and numbers on front hand drawn.
Area of Use Other
Comment Two stick slide rule like Oughtreds first lineal slide rule. Used for calculations of rafter and framing for carpenters. See JOS article I met makers son who helped make these rules.
Rarity RRR
Donor Collection of Clay Castleberry
Match Number 308
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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.