Smithsonian - National Museum of American History, Behring Center

 
Physical Sciences Collection - Surveying and Geodesy

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Theodolite - click to enlarge

Theodolite - click to enlarge

Theodolite - click to enlarge

Click photos to enlarge.

Theodolite

Catalogue number:
1980.0098.03

Inscriptions:
"Hagger Maker Baltimore"

Dimensions:
height 14 inches; horizontal circle 8.5 inches diameter; vertical arc 4 inches radius; needle 4.5 inches; telescope 12.25 inches long (closed); hanging level 5.25 inches

Discussion:
This theodolite belonged to Smith College, but was made well before that school was established. It probably dates from the period 1816-1824, when Benjamin K. Hagger was working in Baltimore, and before he went into partnership with his eldest son. The horizontal circle and vertical arc are silvered, graduated every 30 minutes, and read by verniers to single minutes.

Further Information:

Hagger
Theodolite

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