Exhibits At the Museum

This Day in History

Today: October 22, 2014

October 29, 1878

Willgodt T. Odhner Was Granted a Patent for a Calculating Machine That Performed Multiplications by Repeated Additions

The patent, a modified and compact version of Gottfried von Leibniz's stepped wheel, was acquired and embodied in Brunsviga calculators that sold into the 1950s.