Hart's Mercantile



Centigraph Adding Machine

Hart's Mercantile Calculating Machine was patent in 1878 by William Hart of Kirksville, Missouri. It was produced by the Scovill Manufacturing Company of Waterbury, Connecticut. Hart's calculator was capable of addition, subtraction, multiplication and addition. It was made of brass, which wasn't by chance because the city where it was manufactured, Waterbury, is nicknamed "The Brass City." 

Have one for sale? Please email me at Antikey.Chop@gmail.com