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Keuffel & Esser 20.5-inch Slide RuleLong before electronic computers existed, cartographers used mechanical slide rules such…
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Keuffel & Esser 20.5-inch Slide Rule
Long before electronic computers existed, cartographers used mechanical slide rules such as this to perform various mathematical calculations. Original public domain image from Flickr

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Public DomainFree CCO U.S. Government image for Personal and Business use

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Keuffel & Esser 20.5-inch Slide Rule
Long before electronic computers existed, cartographers used mechanical slide rules such as this to perform various mathematical calculations. Original public domain image from Flickr

More