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Haines Calculating Machine Patent Model
From the collection of National Museum of American History. Free to download, adapt and use — no permission needed.
About this work
This patent model for an adder with a single digit mechanical carry has a wooden base and a circular metal mechanism. At the center is a brass disc that has 100 holes around the outside. Around it is a slightly elevated stationary ring, with the numbers from 1 to 9 engraved around it, representing 10, 20, etc, through 90. Between each of these numbers, smaller digits from 1 up to 9 are engraved. There is a stop at 0.
National Museum of American History’s own descriptionCredit lineHaines Calculating Machine Patent Model. 1849. Haines, William M.. National Museum of American History. CC0.
