Full Details

Name and Model Number Aristo 958
Country of Origin Germany
Date of Manufacture 1950-1970
Front Scales ctg, tg, arc, pix, pix, 1/pix, 1/x, x, x, sq rt i-xsq, sin, cos
Back Scales 1-cos, 1-cos, x sq, x sq, 1/tg alpha.2,sin cos, cos sqx, x, lgx, x cubed
Scale Length 25 cm (10 inches)
Type of Rule Slide Rule
Construction White plastic
Area of Use Topography
Comment Duplex civil engineers or surveyors slide rule with stadia scales.
Rarity RR
Donor Collection of Clay Castleberry
Match Number 316
(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.