Gradienter

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Description:

This instrument is marked "No. 1 U.S.G.S." The horizontal circle and vertical arc are silvered, graduated to 30 minutes, and read by verniers to single minutes. A trough compass and level vial sit atop the telescope; a circular level sits on the horizontal circle. A micrometer attachment, sometimes termed a gradientor, measures the elevation of the telescope with great precision. The words "New November 15 87" are scratched on the underside of the horizontal plate.The U.S. Geological Survey transferred it to the Smithsonian in 1907.

Date Made: 1887

Associated Institution: U.S. Department of the Interior. U.S. Geological Survey

Location: Currently not on view

See more items in: Medicine and Science: Physical Sciences, Surveying and Geodesy, Measuring & Mapping

Exhibition:

Exhibition Location:

Credit Line: U.S. Geological Survey

Data Source: National Museum of American History

Id Number: PH.247905Catalog Number: 247905Accession Number: 47736

Object Name: gradienter

Measurements: horizontal circle: 3 1/2 in; 8.89 cmtelescope: 8 1/2 in; 21.59 cmneedle: 5 1/4 in; 13.335 cmoverall in case: 6 1/8 in x 13 1/2 in x 9 3/4 in; 15.5575 cm x 34.29 cm x 24.765 cm

Metadata Usage: CC0

Guid: http://n2t.net/ark:/65665/ng49ca746a3-2f5e-704b-e053-15f76fa0b4fa

Record Id: nmah_516032

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