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An instrument with graduated rim, magnetic compass, and sighting mechanism was known variously as a graphometer, semicircle, or semicircumferentor. This example has a telescope rather than open sights. The inscriptions read "Bernardinus Pavolini Fecit” and “Antonius Manghetti Incidit."
Ref: Philippe Danfrie, Déclaration de l’usage du graphomètre (Paris, 1597).
Currently not on view
Object Name
overall: 13 in x 7 1/2 in x 16 1/2 in; 33.02 cm x 19.05 cm x 41.91 cm
overall; base: 12 1/2 in x 10 in x 8 in; 31.75 cm x 25.4 cm x 20.32 cm
overall; semicirumferentor: 13 3/4 in x 16 3/4 in x 7 5/8 in; 34.925 cm x 42.545 cm x 19.3675 cm
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Medicine and Science: Physical Sciences
Data Source
National Museum of American History
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