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|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|
|Resource Types:||Web-Based Discussions, Articles, Books, Recreations|
|Math Topics:||Basic Operations, History and Biography|
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