国立アメリカ歴史博物館のインスタグラム(amhistorymuseum) - 4月17日 19時46分

Today is #TaxDay ?. Hopefully, you're not in a rush to turn in your forms ? ?, but if you were, this 1879 tax calculator might come in handy!
Doing the calculations associated with tax collection has inspired inventors from at least the 1600s, when the French mathematician and philosopher Blaise Pascal invented an adding machine for that purpose. In 1879, Robert Levin Mudd—then the county clerk in Bond County, Illinois—patented this tax calculator. The device has sliding tables for calculating the tax due on property worth up to $10,000, at rates of 3 cents, 5 cents, and 25 cents per $100 value. Other columns give the total tax due if assessments are made at several rates for different projects.
Doing your taxes on the go ?? No problem. The entire calculator folds and fits neatly into a wooden case. Mudd was awarded a patent for his calculator on March 11, 1879.
#TaxDay #TaxHistory #PatentHistory #BusinessHistory #AmericanHistory #Invention #Innovation #Patents

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