Full Details

Name and Model Number REWA 10 m Rechenwalze
Country of Origin Germany
Date of Manufacture c. 1910
Front Scales Cylindrical C & D scales in 50 sections
Back Scales none
Scale Length 10 m
Type of Rule Cylinder
Construction Varnished paper scales on metal cylinder (16-cm dia. x 37-cm long) and on metal vanes on a sliding cylindrical sleeve. Wood support stand & wood shell cover.
Area of Use Generic
Comment Similar to Daemen-Schmid 10 m Rechenwalze, but some details are different. May be a copy. Right end of cylinder marked: "A.H. Nitschke. Straupitz-Hirschberg in Schl." Only example known. Smaller 3-m REWA sold at Breker auction in 2007. The REWA brand is unknown to Heinz Joss, the Swiss specialist on cylindrical slide rules. REWA may be an abbreviation for REchenWAlze.
Rarity RRRR
Donor Collection of Ed Chamberlain
Match Number 152
(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.