| 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 |
| Thumbnail (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. |