Drexel dragonThe Math ForumDonate to the Math Forum

The Math Forum Internet Mathematics Library

My Reckonings

_____________________________________
Library Home || Full Table of Contents || Suggest a Link || Library Help
_____________________________________

Visit this site: http://myreckonings.com/

Author:Ron Doerfler
Description: Doerfler's book Dead Reckonings: Calculating without Instruments "describes techniques of computation and approximation that can be used to rapidly and mentally calculate mathematical quantities." Other sections of the site discuss sundials; astrolabes and other ancient analog computers used for astronomical calculations; volvelles and other antique scientific instruments; sophisticated techniques for mental calculation and approximation; stereo photography; and pendulum clockwork. See, in particular, Doerfler's blog, which dates back to October, 2007, and includes posts such as "The Analemmas of Vitruvius and Ptolemy," "The (Not So) Simple Pendulum," "The Art of Nomography," "A 4-Variable Nomogram," "Lightning Calculators," and "Magnetic Deviation."

Levels: High School (9-12), College
Languages: English
Resource Types: Web-Based Discussions, Articles, Books, Recreations
Math Topics: Basic Operations, History and Biography

[Privacy Policy] [Terms of Use]

_____________________________________
Home || The Math Library || Quick Reference || Search || Help
_____________________________________

© 1994- The Math Forum at NCTM. All rights reserved.
http://mathforum.org/