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Physical Sciences Collection - Surveying and Geodesy

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Theodolite - click to enlarge

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Theodolite

Catalogue number:
PH*329731

Inscriptions:
"R. Patten N. York"

Dimensions:
height 12.5 inches; horizontal plate 7 inches diameter; vertical arc 3 inches radius; needle 4 inches; telescope 13.5 inches; striding level 5 inches

Discussion:

This instrument dates from the period 1813-1833, when Richard Patten was in business in New York. The horizontal circle and vertical arc are graduated every 30 minutes, and read by verniers to 2 minutes. The compass on English instruments of this sort reads clockwise; here it reads counterclockwise. The number '6' in a diamond engraved on the baseplate may be a serial number of some sort.

Further Information:

Patten
Theodolite

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