Full Details

Name and Model Number Dennert & Pape
Chemical Slide Rule
Country of Origin Germany
Date of Manufacture `1924 to 1930
Front Scales Chemical, back of slide has more chemicals
Back Scales A table giving the molar mass of various elements or compounds
Scale Length 25 cm
Type of Rule Slide Rule
Construction Mahogany wood with celluloid scale surfaces.
Area of Use Chemical
Comment This example was made by Dennert and Pape and distributed in the USA by Scientific Instrument Company of Pittsburgh (later Fisher Scientific). The words on the slide, Analysen-Stab Nach Dr. Tisza translate to "Analysis Staff or Rod After Dr. Tisza."
Rarity RR-RRR
Donor Collection of Richard Davis
Match Number 162
(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.