Smithsonian - National Museum of American History, Behring Center

 
Physical Sciences Collection - Surveying and Geodesy

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Transit

Catalogue number:
PH*334141

Inscriptions:
"Herm. Pfister for L. M. Prince Cincinnati O."

Dimensions:
height 12.5 inches; horizontal circle 7 inches diameter; vertical circle 5 inches diameter; needle 5 inches; telescope 10 inches long; hanging level 5 inches

Discussion:

Herman Pfister (1847-1911) was born in Switzerland and, by 1870, he was manufacturing surveying and engineering instruments in Cincinnati, Ohio. Louis M. Prince (1850-1918) opened a store in Cincinnati in 1873, selling a wide variety of optical and mathematical instruments. In this instrument the horizontal and vertical circles are silvered, graduated every 30 minutes of arc, and read by vernier to single minutes. There are stadia wires in the telescope, and a clamp and tangent to the telescope axis.

Ref: Charles Smart, The Makers of Surveying Instruments in America Since 1700 (Troy, N.Y., 1962), p. 131; and vol. 2 (1967), p. 234.

Further Information:

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