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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 Az (10d) | Vol. 4 No. 2 | Year 1164z (1948d) ▶️



Click to view PDF

Editor: Ralph Beard

Contents:

  • The New Musical Notation | Velizar Godjevatz
  • Expansible and Reversible Squares | Robert Gutmann
  • What is π? | George S. Terry
  • A Duodecimal Slide Rule | Kingsland Camp
  • Twelve Directions | F. Emerson Andrews
  • Pythagorean Triangles with Equal Perimeters | Harry C. Robert, Jr.
  • Table of Periods of Primes and Powers of Primes, to Various Bases
  • The Mail Bag
  • Counting in Dozens