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Earth rotation study...

Item # 206974

May 31, 1851

NATIONAL INTELLIGENCER, Washington, May 31, 1851  Ftpg. article: "To Make Artificial Marble And Stone". Also under "Communications" are three letters: "Rotary Motion Of The Earth" "M. Foucaults Demonstration Of The Earths Rotation" "Mr. Foucaults Experiment". Lite rubbing on the front page. 

Category: Pre-Civil War