Feb. 24 1839 – William Otis oh Philadelphia patents the steam shovel for making railroads. It was capable of moving 380 cubic meters of earth per day.
Jan. 14 1798 – David Wilkinson of Rhode Island patents a nut & bolt machine. He would also create a lathe for cutting screw threads, which was really useful in the early 1800s.
Dec. 9 1906 — Happpy Birthday Walter Zinn. He is credited with initiating the world’s first self sustaining nuclear chain reation by withdrawing a control rod from the world’s first nuclear reactor in Chicago.
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