Results for "Inventions"

 
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  1. Unidentified Female Works With Periodometer

    Sneak Peek 2/24/2014

    • Date: February 24, 2014
    • Creator: Marguerite Roby
    • Description: Unidentified female works with a Periodometer, a machine invented by fifth Smithsonian Secretary Dr. Charles Greeley Abbot that analyzes solar records.

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Showing results 1 - 1 of 1 for Inventions