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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 66z (78d) | Vol. 33z (39d) No. 3 | Year 119Az (1990d) ▶️



Click to view PDF

Editor: Dr. Patricia Zirkel

Cover Title: DSA Annual Meeting 1990 Schedule

Contents:

  • Schedule, 1990 Annual Meeting
  • A Note on the Chinese Calendar | Igor valevsky
  • Binary Coded Digits | Gene Zirkel
    • Introduction
    • Part One
      • An Ongoing Argument
      • Some Background
      • An Example
    • Part Two
      • Arithmetic
        • Adding With No Carry
        • Adding With a Dozenal Carry but No Binary Carry
        • Adding With a Binary Carry
        • Carrying 2 Eightss
        • Subtraction and Borrowing
    • Conclusion
  • Digit Reversal | A Puzzle
  • Dozenal Jottings | From Members and Friends
    • Jamison & Vera Sharp Handy | traveled extensively this summer
    • David Singmaster | “Recreational Problems Down the Ages” at HIstory in Mathematics Education 1990 Conference, London
    • Ian Patten | navigational measure system influenced by Henry Churchman’s Doremic
    • New Member: Don Hill, Asst Headmaster, Mercersburg Academy
  • Solution to “Rock − It” | Charles Ashbacher
  • Available from the DSA
  • Why Change?
  • Counting in Dozens