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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.

A Duodecimal Scale

Title: A Duodecimal Scale
Author: Dr. Edward Brooks
Year: 1104
Subject: A turn-of-the-century account of dozenal arithmetic and notation.
http://www.dozenal.org/../sites_bck/default/files/DSA_brooks_philosophy_arithmetic.pdf
This work by Dr. Edward Brooks, a famed philosopher of mathematics, explains his system of dozenal notation and gives a brief explanation of arithmetic in dozenal, providing examples of all four functions. Yet another excellent piece from a distinguished mathematician showing the benefits of the dozenal system.
© 11E9-1205 (decimal 2013-2021). The Dozenal Society of America. Contact Us
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This website and the documents on it are licensed under a Creative Commons Attribution 3.0 Unported License.
Numeration on this site is in dozenal (also called duodecimal, or base twelve), using "X" for ten and "E" for eleven.
0 1 2 3 4 5 6 7 8 9 X E 10 11 12 13 14 15 16 17 18 19 1X 1E 20 21 22...
PDF documents may use a Dwiggins stylized "X" and "E" or the Pitman inverted "2" and "3".
The Humphrey point, or semicolon, is used for fractional parts; e.g., "0;6 = 0.5."