The Duodecimal Bulletin

is an official publication of The Dozenal Society of America, Inc.
Editorial Office:
5106 Hampton Avenue
Suite 205
Saint Louis, MO 63109-3115

Michael De Vlieger, Editor

Index Links:

About the Bulletin

Archive Index

Pictorial Synopses:
011-00 to 043-0E
051-10 to 0E2-1E
101-20 to 152-2E
161-30 to 230-3E
240-40 to 293-4E
2X1-50 to 313-5E
314-60 to 352-6E
361-70 to 3E2-7E
401-80 to 452-8E
461-90 to 4E2-9E
501-X0 to 552-XE

About the Archive

The Duodecimal Bulletin Pictorial Index

Whole Numbers 70; (seven dozen) through 7E; (seven dozen eleven)

Back issues between 11X1; (1993.) and 11X6; (1998.) are currently available as web optimized PDF documents. Click on the icon of the magazine to view a PDF of the corresponding issue.

Click here for more information about the pictorial archive (Please scroll to the bottom of the destination page).

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361-70 (1993)
Congruences in dozenal
divisibility tests,
Nu’s best base essay,
Kapreker, factorials

362-71 (1993)
Schiffman’s modular
arithmetic checking,
numerals, powers of two,
time periods

371-72 (1994)
Schiffman’s dozenal
combinatorics, sigfigs
& factorials,
twelves and LCMs

372-73 (1994)
Newhall’s dozenal
chronology, Dean’s
nonintegral bases,
Pascal’s triangle

381-74 (1995)
Schiffman’s integer
personalities to
one gross
Travis book reviewed

382-75 (1995)
Perfect numbers,
Marino’s full dozenal
system; Zirkel’s brief
dozenal primer

391-76 (1996)
Calculator conversions,
metric, Lauritzen,
Faulkner’s & Chu’s essays
Authors’ guide

392-77 (1996)
US aversion to metric
Moon’s perfect number
problem, design contest
for transdecimals

3X1-78 (1997)
Dr. Impagliazzo’s “Dits
& Dozens”, “Save the
Inch”, Schiffman’s
Fibonacci numbers

3X2-79 (1997)
Dozenal dates,
Schiffman’s digits of
dozenal integers,
NPR Interview

3E1-7X (1998)
Lauritzen’s numerals,
Schiffman’s recursive
sequences in three bases
How metric is Europe?

3E2-7E (1998)
Evidence of metric
unpopularity, nonsense,
Patten’s Law (best
base essay).

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Exquisite Analysis, and Dear Friends Lost

This dozen-issue set sees Prof. Jay Schiffman take the Editorship, and continue the exquisite analysis of the mathematical properties of base twelve. He and others explore the Fibonacci sequence, modular checking of arithmetic, factorials and significant digits, perfect numbers, properties of dozenal digits, and number-theoretical properties of integers less than one gross. Anti-metric discussion is minimal but not forgotten. William Lauritzen and Timothy Travis write books involving the dozen and are reviewed. It seems more often than not, an obituary to a mainstay of the Society both here or in Britain appears in the Bulletin. Notables like Don Hammond, British editor; Fred Newhall, bibliographer; Henry Churchman, editor; Charles Bagley, longtime board member; James Malone, author, treasurer, board chair; Dudley George, early enthusiast, longtime member and fellow; Jamison “Jux” Handy, Editor and early Member, all pass on. On 18 July 1995, Prof. Gene Zirkel was interviewed on National Public Radio’s “All Things Considered” on the merits of duodecimal numeration.Continue »

This page revised Saturday 3 September 2011.