Full Details

Name and Model Number Kern Stadia Slide Rule
Country of Origin Switzerland
Date of Manufacture Early 1900s
Front Scales Stadia surveying calculation scales
Back Scales none
Scale Length 24.9 cm
Type of Rule Slide Rule
Construction Nickel or German silver
Area of Use Technical
Rarity RRR
Donor Collection of Clay Castleberry
Match Number 239
(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.