Full Details


Name and Model Number Stanley Rule and Level Co. No. 6
Country of Origin USA
Date of Manufacture Offered 1859-1898
Front Scales Measuring scales in inches up to 24 when opened
Back Scales A B on slider, Girt line scale
Scale Length 30 cm (12 inches)
Type of Rule Rule
Construction Brass slider and hinge and box wood
Area of Use Other
Comment Engineering slide rule for square, circular, and globe calculations. Timber volumes too. Earliest of only two (# 6 & # 16) engineering rules by Stanley was 1859. Engineers scales referred to, were actually engineering type gauge points for power and other calculations.
Rarity RRR
Donor Collection of Clay Castleberry
Match Number 293
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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.