— One of five extant Baldwin Arithmometers from 1874.Frank Baldwin is best known for his work perfecting the Monroe calculators. Frank S. Baldwin’s adding- subtracting- machine was one of the first ever sold in the United States.
He was 36 years old when he was granted the patent for this machine which could add and subtract numbers between 0 and 999,999. His machine, he called The Arithmometer, was meant to “lessening the labor of adding long columns. The mental strain involved in long continued addition is exceedingly monotonous and fatiguing. Indeed, instances are not wanting where persons employed constantly on this work have become monomaniacs, or partially deranged in consequence,” read more>>
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