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Dozenal Society of America
Promoting base twelve and alternative base mathematics
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The Dozenal Society of America
The DSA is a voluntary, nonprofit education corporation, organized for the conduct of research and education of the public in the use of dozenal (also called duodecimal or base-twelve) in calculations, mathematics, weights and measures, and other branches of pure and applied science.

The Duodecimal Bulletin

◀️ Issue: Whole Number 15z (17d) | Vol. 7 No. 1 | Year 1167z (1951d) ▶️



Click to view PDF

Editor: George Terry

Contents:

  • Why Change?
  • The Annual Meeting
  • Twelve Time | R. T. Lynhart
  • An Item on Triangular Numbers | Lewis Carl Seelbach
  • Natural Logarithms: Computing the Natural Logarithsm of the First Eight Primes to Six Dozen and Three Places | Harry C. Robert, Jr.
  • A Measuring Wheel
  • Do-Metric Dynamic Measures | Ralph H. Beard
    • Correction for Units of Mass
  • Conversion Doubles, or Duodecimal Numbers Which Represent Twice as Much as the Same Digits Interpreted Decimally | H. K. Humphrey
  • Members Can Help Augment the Duodecimal Bibliography | Lewis Carl Seelbach, Chairman, Committee on Bibliography
  • Shake Hands with Octal
  • The Man with Twelve Fingers | F. H. Ames, Jr.
  • Counting by Twelves
  • Counting in Dozens