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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.

Regional Meetups

The Dozenal Society of America holds occasional regional meetups in addition to the Annual Meeting in various locations around the country. These occur irregularly and are typically held by individual members who live in that area; in the past such meetups have occurred in St. Louis, MO and Chicago, IL. We chat about your ideas, duodecimal mathematics and systems of numeration in an informal venue. Duodecimal literature (The Manual of the Dozen System, recent Duodecimal Bulletin hardcopies, and handouts, each while supplies last) are available at the meetings; everyone comes home with dozenal goodies. Tell us what you think, share your thoughts or suggestions, and have a great dozenal time! Let’s touch base, literally!

For information on these meetups, please contact us at; we hope to continue holding them in the Midwest, and to begin holding them in the mid-Atlantic and the Northeast. If you'd like to assist with such a meetup in these or other areas, please contact us, as well.

The 2011 Midwestern Summer Socials

A couple Members turned out at the Schlafly Tap Room in St. Louis Wednesday evening, 17 August 2011 (Wednesday 15; August 11E7;). An engineer, architect, and web designer go to a bar, and discuss number bases and the efficiency of dozenal, especially with fractions. (No joke!) One came to dozenal when he was attempting to build an analog decimal clock. He got to thinking of the implications on units of measure; if the second were abandoned, what would that do to the watt? He then visited this site and came to join for the sheer sake of intellectual consideration of dozenal. He prefers the printed version of the Duodecimal Bulletin. We had a ball and discussed travels in Europe and our careers.

Three Members met at Panera Bread near the Woodfield Mall in Schaumburg near Chicago Sunday afternoon, 30 July 2011 (Sunday 26; July 11E7;). We discussed music and the dozen, as one of the Members wrote a three-part article on music for the Bulletin (which we will be digitally remastering). We discussed dozenal mathematics and what brought us to dozenal.

Get-togethers at “Home”

In St. Louis, we might dine etc., visiting the St. Louis office if desired before or afterwards, where we can discuss any dozenal issue at length. The St. Louis office of the DSA is home to a full range of dozenal literature, including every issue of the Duodecimal Bulletin, the British Duodecimal Review, Duodecimal Newscast, Dozenal Journal, the Australian Modular Conversion Bureau, and writings from New Zealand. George Terry’s Duodecimal Arithmetic, Jean Essig’s Douze Notre Dix Futur, Dr. Glaser’s A History of Binary and Non Decimal Numeration, Andrew’s works are also available for review. It is also the production center for the Duodecimal Bulletin. St. Louis is notable for its many fine restaurants, catering to practically any cuisine. Let’s discuss a favorite subject at a venue that facilitates our love of twelveness! If you’re in town and game to discuss dozens, let us know! (Give us a heads-up, a couple weeks in advance if possible).

General Information on Get-togethers “Away”

Our regional get-togethers are not formal, but we will be prepared to talk about dozenal mathematics. Some printed resources will be available. We like to tailor our regional get-togethers to those who attend. Folks who respond can request or suggest venues, meeting times and topics, and resources that we bring to the meeting (Contact us here). If you’re suggesting a venue outside St. Louis, bear in mind that we may “talk business”, involving handouts, publications, etc., and don’t want to bother other diners. So the place should be one where business is welcome. Note that all “away” meetings are limited by the fact that the DSA relies on volunteer efforts; we can’t reach many locations. In general, the meetings are arranged by traveling Members who happen to be in the area, or are within a radius of the places participating Members live.

Generally, we’ll take a look at the current Duodecimal Bulletin issue under production, and will have Membership Forms on hand for your convenience.