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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 56z (66d) | Vol. 30z (36d) No. 1 | Year 1197z (1987d) ▶️



Click to view PDF

Editor: Dr. Patricia Zirkel

Cover Title: Art Contest!

Contents:

  • Minutes of Annual Meeting of 1986 (1196;)
    • Board of Directors Meeting
      • Remarks of teh Chair | Dr. John Impagliazzo
      • Committee Appointments 1986-1987
    • Annual Membership Meeting
      • President’s Report | Gene Zirkel
      • Treasurer’s Report | James Malone
      • Editor’s Report | Patricia Zirkel
      • New Business
    • Afternoon Presentations
      • Fred Newhall | evolution of number systems
      • Gene Zirkel | Another Set of Symbols: Binary Coded Dozenal Digits
      • Ellis Von Eschen | multiplicative magic squares
      • Dudley George | factoring in decimal and dozenal
    • Evening Banquet
  • Art Contest: Brochure Design Contest with cash prizes
  • Terminal Digits of Pentagonal Numbers | Charles W. Trigg
  • In Memoriam: William C. Schumacher
  • Annual Award 1986: Gene Zirkel
  • Number Bases Elsewhere, part III
      Joe Baehr | letter to Mathematics Teacher | “proof” that half of eleven is six
  • Dozenal Jottings
    • Dr. John Impagliazzo | guest lecturer at International Centre for Theoretical Physics in Europe
    • Fred Newhall | in University of Rochester Review
    • Gene Zirkel | “Half of 12 is 7”
    • Bruce Moon (New Zealand)
    • Jerry Brost | proposes “Twella” as panda mascot name
    • Robert $. McPherson
    • Arthur Whillock (DSGB)
    • New members:
      • Robert K. Sonntag
      • Elaine O. Furman
      • David Adam Horowitz
      • Prof. Larry J. Aufiero, Nassau Community College
      • Paul M. Schumacher
  • Puzzle Corner: “Twelves”
  • Why Change?
  • Counting in Dozens