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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 A5z (125d) | Vol. 55z (65d) No. 1 | Year 1209z (2025d) ▶️



Click to view PDF

Editor: John Volan

Associate Editor: Michael DeVlieger

Cover Title: In Memoriam: Gene Zirkel, Dozenalist

Contents:

  • Former President’s Message | Donald Goodman III
  • Reprint: From the (Past) President’s Desk | Gene Zirkel
  • Gene Zirkel: Dozenal Great | Michael DeVlieger
  • Feature: The Dozenal Missionary | Michael DeVlieger
  • Reprint: I’m a Dozener | Gene Zirkel
  • Reprint: Ralph Herbert Beard | F. Emerson Andrews
  • Reprint: What’s in a Name? | Gene Zirkel
  • Reprint: Nationwide Coverage | Gene Zirkel
  • Regular and Rhombic Dodecahedron | Michael DeVlieger
  • Reprint: Dedication F. Emerson Andrews Library | Gene Zirkel
  • Reprint: Roman Dumerals | Bro. Louis Francis FMS
  • Reprint: In Memoriam: Henry Churchman | Gene Zirkel
  • Reprint: Origin of Asterisk and Octothorpe | Gene Zirkel
  • Feature: A True Dozenal Legend | Jay Schiffman
  • The Mailbag
  • Reprint: Education Needed | Gene Zirkel
  • Feature: Gallo Roman Dodecahedron | Raymond E. Greaves
    • Abstract
    • The Dodecahedron
    • Archaeological Finds
    • A Night Candle Clock
    • Examination of Evidence
    • Roman Measure
    • Chandlers
  • Roman Fractions
  • Application Form
  • Precision Dozenal Tools (Advertisement)