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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 64z (76d) | Vol. 33z (39d) No. 1 | Year 119Az (1990d) ▶️



Click to view PDF

Editor: Dr. Patricia Zirkel

Cover Title: Alice Berridge, Gene Zirkel, Tony Scordato named DSA Fellows

Contents:

  • Minutes of Annual Meeting 1989d (1199z)
    • Board of Directors Metting
    • Annual Membership Meeting
      • Reports of Officers and Individuals
        • President’s Report | Fred Newhall
        • Treasurer’s Report | Anthony Catania (presented by Alice Berridge)
        • Editor’s Report | Dr. Patricia Zirkel (presented by Gene Zirkel)
      • Reports of Committees
        • Annual Meeting Committee | Barbran Smith, Anthony Catania, Larry Aufiero, Alice Berridge
        • Finance Committee
        • Nominating Committee
    • Afternoon Presentations
      • Jay Schiffman | A Survey of Duodecimal Number Theory
  • Dozens in Australia
    • Peter D. Thomas | The Modular System: A Preview of the Counting and Measurement System of the 21st Century
    • Modular Convention Bureau
  • Square Root of Two — Revisted | Brian Dean
  • Nu-Age World Calendar | Fred Newhall
  • Music, Scales and Dozens, Part I | Dr. John Impagliazzo
    • Introduction
    • Mathematical Considerations
    • Pythagorean Scales
  • Dozenal Jottings | From Members and Friends
    • Gene Zirkel
    • Arthur Whillock | response to David Fairchild | Pendlebury did indeed design a slide rule
    • Donald Hammond
    • Modular Convention Bureau (Australia) | MCB Newsletter; Australian Metric Record
    • Charles F. Marschner
    • Jamison Handy, Arthur Whillock, Charles Marschner, Charles Ashbacher | responding about hexadecimal A–F
    • New members: John Stewart, Ian B. Patten, Peter D. Thomas
  • In Memoriam — Bob Boase
  • Dozenal Calculators | Paul Rapoport
  • Why Change?
  • Counting in Dozens