Collection of pages from K&E catalogs for the Deci-Lon Family of Slide Rules
Catalog pages from the 1967 catalog
The Deci-Lon family of slide rules are duplex type of slide rules. The Deci-Lons were constructed on a plastic frame. The Deci-Lon was the last new slide rule design by K&E. The Deci-Lon functionally replaced the Log Log Duplex Decitrig slide rules but never displaced them from the product line. The Deci-Lon has the most extensive scale set of any K&E slide rule.
The scale set is as follows:
Ln-3 Ln-2 Ln-1 Ln-0 A = B T SRT S C = D DI K
Sq1 Sq2 DF = CF CIF L CI C = D Ln0 Ln1 Ln2 Ln3
The following models are part of the Deci-Lon family and only vary in length:
- 68-1100 (Deci-Lon 10) --- 10"
- 68-1130 (Deci-Lon 5) ---- 5"
The Deci-Lons first appeared in the 1962 catalog. The Deci-Lon family last appeared in the 1972 catalog. The following is a brief history of the Deci-Lon family of slide rules as is told in the K&E catalogs that are available at this time. Exact timing is not possible because of the time between catalogs.
These are the known variants of the Deci-Lon 10:
- Early production had green leather cases.
- Aluminum inserts were place in the end blocks.
- The metal frame of the cursor shape was changed for better alignment.
- Sometime after 1970 the colored vertical marks on the end of the slider were removed.
- 1962 - The 68-1100 (Deci-Lon 10) and 68-1130 (Deci-Lon 5) were shown in a catalog.
- 1972 - The 68-1100 (Deci-Lon 10) and 68-1130 (Deci-Lon 5) were last shown in this catalog without vertical lines on the ends of the slider.
Links to catalog pages for the Deci-Lon family of slide rules:
Scans: Link to scans of Decilons