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Miscellaneous: Life Span Calculator (wheel)

About Wheels


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7.5" calculation wheel, two sided. When theologians in the 17th century got bored they invented things like decimal points, slide rules, logarithms, and algebra. When Erik gets bored he reinvents obsolete circular calculation devices. This item is an absolute necessity if you're ever without electricity (or pocket calculator) and you simply must calculate how many days you've lived since the day of your birth. The string as an alignment tool adds authenticity to the historic nature of volvelles. The 14-15th century originals used strings to align data, too! A "build it yourself" wheel: simply download, glue, cut, and affix. Get the free Assembly Instructions to see how easy it is to build your own information data wheel.

Price: $5.00