Full Details


Name and Model Number Dr. Grunert's
Pythagoras-Rechentafel
Country of Origin Germany
Date of Manufacture c. 1910
Front Scales 12 sections repeated 4x horizontally & vertically
Back Scales none
Scale Length Approximately 2 m
Type of Rule Other
Construction Paper on wood
Area of Use Other
Comment For solving the Pythagoras theorem equation.

Rarity RRR
Donor Collection of Ed Chamberlain
Match Number 144
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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.