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| Keywords: Voyage in Space page023.png en A Peaucellier cell used to demonstrate the inverse square law of gravity The force required to support the node C is inversely proportional to the square of the distance CS A Voyage in Spacehttps //archive org/details/voyageinspacecou00turnrich Herbert Hall Turner 1913 1930 A Voyage in Space Peaucellier “Lipkin linkage | ||||
