"The Log Log Duplex Trig"

"Slide Rule"

"No. N4081"

by: Lyman Kells, Willis Kern, and James Bland

Copyright 1947

The 1947th edition had several variations in front covers and several addendum and errata sheets. All of these manuals have identical text except for the one with an errata sheet of corrections.

There were also two addendums. This manual was not edited through two scale additions. These addendums cover the new scales.

Another addendum was issued to allow the use of this edition of the manual for older versions of the 4081-3.