For those interested in the history of computing -- Volvelle "Paper Computer | Retronaut

[Tom Johnson]

http://www.retronaut.com/2014/04/volvelle-paper-computer/

“A volvelle is considered an early example of a paper analog computer. Volvelles have been produced to accommodate organization and calculation in many diverse subjects. Early examples of volvelles are found in the pages of astronomy books.”

-tom johnson

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