The Dozenal Society of America

The Society is a voluntary nonprofit educational corporation, organized for the conduct of research and education of the public in the use of base twelve in calculations, mathematics, weights and measures, and other branches of pure and applied science.

Duodecimal Bulletin:

About the Bulletin
Archive Index
Pictorial Synopses
About the Archive

Welcome!

Why do some people propose that we learn to count in twelves in addition to counting by tens? Why did people who use arithmetic every day - engineers, teachers, mathematicians, businessmen and consumers - choose to band together and form the Dozenal Society of America? Isn’t counting by tens easier, especially with the zero? What about decimal fractions such as 3.14159...? To find out the answers to these and similar questions, visit “Fundamental Operations in Duodecimal”.

For Beginners and Students

Are you interested in using different number bases, or you’re studying number bases in school? Check out our Basics section, or visit “A Brief Introduction to Dozenal Counting”. You’ll learn how to get started using twelve as a number base, multiplying and dividing, adding and subtracting, just as well (better!) than in decimal. Learn how to convert decimals to dozenals and back again by visiting “Decimal-Dozenal Conversion Rules”. Need a simple way to understand positional notation in base twelve? Try “Eggsactly a Dozen”. We are busy producing web resources that help you understand the basics for duodecimal arithmetic. Take a look at our multiplication table page.

Dozens are all around us, every day; in our packaging, our units of measure, on the clock on the wall. That’s because the dozen is a highly composite number. Check out “Music, Scales, and Dozens” and read how the dozen can be found in our music. Find these articles and more at our Resources section.

Interested in More?

The DSA has been around since World War II, and has since that time published its Duodecimal Bulletin. Check out all the back issues of the Duodecimal Bulletin at our free archive! Want to receive the Bulletin electronically? Membership is only one dozen six USD ($18.) per year. Have the Duodecimal Bulletin mailed to your address, if you join at the Supporting Level of three dozen USD ($36.) per year. Your membership helps us produce the Duodecimal Bulletin twice each year, host meetings, and maintain this website.

For Dozenalists

The DSA maintains over 3600; pages of dozenal papers in its digital archive. Over time, the very best papers are being digitally remastered and updated, appearing at our Resources section. Are you interested in the numerals folks have created for bases larger than ten, or are you interested in designing your own numerals? Interested in the history of the DSA and its sister society, the Dozenal Society of Great Britain? Read F. Emerson Andrews’ “My Love Affair with Dozens” for a Founder’ recollections of how the DSA came to be, back between and during the World Wars.

Visit our sister society, the Dozenal Society of Great Britain, at the DSGB website and its DozensOnline web forum. Miss the old site? Click here to visit it. If you’re interested in Michael Punter’s dozenal calculator software, visit this legacy page. If you are interested in the four Aspirant’s Tests, check out this legacy page. The tests will be remastered and made available at our Resources section in the near future.

Come Join Us!

From time to time a regional meeting among local Members takes place. 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! Details will be available at the Social Page!

The DSA meets annually. Several of us met at Long Island 21; June before the meeting and carted away boxes of Bulletins and pamphlets as we cleaned out our old office. Note that the Annual Meeting has been rescheduled! Our next Annual Meeting is coming up in the New York City area on 23; July 11E8; (27 July 2012.), and you’re invited! Send in your Membership form today!

Recently, the DSA has cleared out its Long Island office. This has resulted in the issuance of several regional archives. The former address in Babylon, Long Island, NY is no longer valid. Please use the address printed in the Duodecimal Bulletin, Vol. 50; and beyond. The correct address also appears on the Membership form.

Visit Often?

Take a look at What’s New. Check out the new Dozenal FAQs PDF, which answers one dozen frequently asked questions about duodecimal numeration. This document is two dozen pages long and full of graphics, it weighs 5.62 Mb. It will be divided into separate sections in the near future to facilitate access. Vol. 50; No. 1, the ten-dozenth issue of the Duodecimal Bulletin, is in production! Want to see a particular article reproduced in a fresh downloadable format? Send your suggestions to the Editor of the Duodecimal Bulletin.

Follow Us on Twitter and Facebook!

We dozenalists have to stick together! Check into our tweets (@dozenal) and like us on Facebook! From time to time and at the discretion of the Editor, some material from the current issue of the Duodecimal Bulletin may be linked from our social media outlets! Chat with fellow dozenal enthusiasts!

This page last modified Monday 26 March 2012.