Circa 1920s- 1950s Addometer
This eight-wheeled stylus-operated adding machine has metal wheels and frame. The wheels each have ten holes around the edge. The two rightmost are white, the next three are red, and the next three are white. All the wheels are labeled around the outside with digits for use in addition and around the inside with digits for use in subtraction. A steel stylus and a clearing bar fit into the right side. The top edge of the instrument has an 11-inch scale of equal parts, divided to sixteenths of an inch. The machine was made by the Reliable Typewriter & Adding Machine Company of Chicago, Illinois. americanhistory.si.edu
Consistent with age and use.
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