Pike Graphometer

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This graphometer is marked "B. Pike Jr New York" and "Benjn Pike Jr 294. Broadway N.Y." The semicircle is graduated to 30 minutes, and read by silvered verniers at either end of the alidade to single minutes. Benjamin Pike Jr. (1809–1864) was in business in New York during the period 1843–1864. He probably imported this instrument from France. New, it cost $30. The vertical sights were reconstructed at the Museum.
Ref: Benjamin Pike, Jr., Illustrated Descriptive Catalogue of Optical, Mathematical, and Philosophical Instruments (New York, 1856), pp. 64–65.
Currently not on view
Pike, Jr., Benjamin
place made
United States: New York, New York
overall: 12 in; 30.48 cm
needle: 3 1/2 in; 8.89 cm
overall; pike: 1 in x 7 3/8 in x 2 1/4 in; 2.54 cm x 18.7325 cm x 5.715 cm
overall; graphometer: 4 7/16 in x 11 15/16 in x 6 in; 11.27125 cm x 30.32125 cm x 15.24 cm
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Data Source
National Museum of American History