Full Details

Name and Model Number REKA Rechenapparat
No. 1439 by Dr. L.Nones
Country of Origin Germany
Date of Manufacture c. 1948
Front Scales 12 sections repeated 4x horiz. & vert.
Back Scales none
Scale Length 2.4 m
Type of Rule Other
Construction Paper scale surface on plywood, 44cm x 29cm & two reversible card stock "trellis" slides with 3 different scales for: a) mult. & div.; b) conversion of day and year interest values; and c) inverse mult. & div.
Area of Use Generic
Comment See article by Otto van Poelje in JOS, v.21, n.2, 2012.
Dr. L. Nones 1083 & Reka-vertriebsgellschaft, Hildburghausen i. Thüringen printed near one edge.
Rarity RRR
Donor Collection of Ed Chamberlain
Match Number 172
(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.