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"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.

• Early wine colored front cover and errata sheet.
• Red colored front cover
• Green with red highlight cover

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

• DI Scale - The DI scale was added to the 4081-3 in 1953.
• SRT Scale - The ST scale was converted to a SRT scale in 1955.

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

• "Extracts from the Manual on the Old Style LOG LOG DUPLEX DECITRIG SLIDE RULE"

• Title page, slide rule illustration, copyright page, and Preface
• Table of Contents ---------------------------------------------------------------------- pages 1-2
• Chapter I --- Multiplication and Division ----------------------------------------------- pages 3-14
• Chapter II -- The Proportion Principle and Combined Operations ---------------------- pages 15-28
• Chapter III - Squares and Square Roots, Cubes and Cube Roots ---------------------- pages 29-39
• *Chapter IV - Trigonometry
  • Part 1 -------------------------------------------------------------------------- pages 40-49
  • Part 2 -------------------------------------------------------------------------- pages 50-61
  • Part 3 -------------------------------------------------------------------------- pages 62-73
• Chapter V -- The Log Log Scales
  • Part 1 -------------------------------------------------------------------------- pages 74-86
  • Part 2 -------------------------------------------------------------------------- pages 87-99
• Chapter VI - Logarithms and the Slide Rule -------------------------------------------- pages 100-109
• Historical Notes on the Slide Rule ------------------------------------------------------ pages 110-112
• Answers ------------------------------------------------------------------------------- pages 113-121
• Index ---------------------------------------------------------------------------------- pages 122-123

These manuals are from the collection of Clark McCoy