Euclid's Muse

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Abacus Corrected

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Phil Todd

@polymnia

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An abacus clock.  Our previous version illustrated an idiosyncratic use of the abacus.  In this version, we conform to international standards: the value of the "five" bead is 0 when it is in the upper position, and 5 in the lower position.

Tags: abacus, clock
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