Full Details

Name and Model Number A. M. Maurand
Prompt Calculateur
Country of Origin France
Date of Manufacture ca. 1865
Capacity Simple calculations and conversion of units
Construction Brass box with glass lid and hand colored cardboard tables
Area of Use Other
Comment Universal Ready Reckoner.
Awkward to handle.
Also mentioned in Comptes Rendus des Séances de l'Académie des Sciences. Paris. 61, 425.
Rarity RRR
Donor Photo from a collection in Germany
Match Number 77
(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.