Telescope (micrometer), ca. 1780
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Photo courtesy of Monticello/Thomas Jefferson Foundation, Inc.

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Paris (Passy)
Alexis-Marie Rochon (Attributed)
Iceland crystal, brass, leather, pressed board, paper, and textile; L. closed 14 in. (35.6 cm), L. open 19 in. (48.3 cm), Diam. 2 1/6 in. (5.5 cm)
Monticello: The Home of Thomas Jefferson (Charlottesville, Va.), 1992-4-2a-c
This micrometer was given to Franklin by the pioneering astronomer Alexis Rochon, inherited by Francis Hopkinson, and given by him to Thomas Jefferson. It can still be seen at Monticello. Terms of Use Credits