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Addac adding machine

1926

Mechanised adding machine, paper and case

1920-1940

Cordingley's computometer', adding machine, c 1900.

1890-1910

Summira 7 adding machine

1927

Simple wooden adding device with stylus

"American" Adding Machine

1912-1920

Adding machine by DTA

Mechanical counter

1891-1900

Pangborn adding machine ("The Calculator")

1908-1930

Union spiral adder

1905

"American" adding machine

Example (no.6173) of the "Rapid Computer" patented in 1892 by the Baker-Vawter Co.

1892-1900

Adix adding machine in case

circa 1905
Arithmographe polychrome, adding machine invented by Charles Dubois, c. 1866, for 12 figures, black metal and dark wood with bone stylus in original box

Arithmographe polychrome adding machine, with wooden case and bone stylus

1865-1875
"Locke adder" calculating device patented 1901 and made by C.E. Locke Manufacturing Company, Kensett, Iowa, in original box (distressed) with instruction manual

Locke Adder calculating device

1901-1910
"Adix" adding machine, (1903)

Adix adding machine

1903-1905
Mechanical counter for billiards, by A. Weinreiss, made by Kolner Billard-Fabrik with leatheratte case.

Mechanical counter for billiards

Quixsum Fractional Adding Machine, Model C-2728, patented 1924 and made by Precision Adding Machine Co. Inc. (Providence, Rhode Island and Charlotte, North Carolina) with plastic slip case.

Quixsum Fractional Adding Machine

1924-1930