Refractive sundial, 1578
Photo courtesy of American...
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Photo courtesy of American Philosophical Society

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Augsburg, Germany
Christopher Schissler
Copper, brass, silver, and gilding; Diam. 12 in. (30.5 cm)
American Philosophical Society (Philadelphia, Pa.), 58-66
Comparison between this implement and Franklin's electrostatic machine illustrates vividly the advances in the study of the physical sciences during the years from its creation to Franklin's period of experimentation. Terms of Use Credits