National Museum of American History
Patent Model for Circular Slide Rule Invented by John W. Nystrom
Nystrom, John William · before 1851
The expansion of American engineering in the nineteenth century created a new market for aids to computation. The Swedish-born Philadelphia engineer, John William Nystrom (1824–1885), contributed to this movement by inventing a circular slide rule in 1848 and writing a pocket book of mathematical tables that was reprinted at least 21 times between 1854 and 1895.
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