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Mathematical Table, J. D. Smith Machine For Multiplying Numbers
From the collection of National Museum of American History. Free to download, adapt and use — no permission needed.
About this work
This is the United States patent model for a multiplication table. It consists of a wooden disc pivoted to a wooden handle on which it revolves. The front of the part of the handle above the disc is a metal rod with the numbers 1/4, 1/2, 3/4, 1 through 10, and 20 engraved on it. The top of the disc has numbers engraved over its surface such that one can line up the handle with a number on the edge of the disc and find multiples of that number on the disc next to the engraved numbers on the handle.
National Museum of American History’s own descriptionCredit lineMathematical Table, J. D. Smith Machine For Multiplying Numbers. 1857. Smith, James D.. National Museum of American History. CC0.
