Collection of pages from K&E catalogs for the 4138 Morrison
Radio Engineer's Slide Rule
The 4138 Morrison Radio Engineer's Slide Rule was a special slide rule for solving problems in radio engineering in the time frame of 1939. It had a set of 9 scales specifically for radio proprogation.
The 4138 only appeared in the 1939 catalog of the catalogs available.
Scans: Scans of a 4138