Smithsonian - National Museum of American History, Behring Center

 
Physical Sciences Collection - Surveying and Geodesy

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Graphometer - click to enlarge

Graphometer - click to enlarge

Click photos to enlarge.

Graphometer

Catalogue number:
PH*318373

Inscriptions:
"B. Pike Jr New York" and "Benjn Pike Jr 294. Broadway N.Y."

Dimensions:
length 12 inches; needle 3.5 inches

Discussion:
This semicircle of this graphometer is graduated to 30 minutes, and read by silvered verniers at either end of the alidade to single minutes. Benjamin Pike, Jr. (1809-1864), who was in business in New York during the period 1843-1864, 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.

Further Information:

Pike
Graphometer

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