Gradienter
Gradienter
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Usage conditions apply
- 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.
- Location
- Currently not on view
- Object Name
- gradienter
- date made
- 1887
- associated institution
- U.S. Department of the Interior. U.S. Geological Survey
- Measurements
- horizontal circle: 3 1/2 in; 8.89 cm
- telescope: 8 1/2 in; 21.59 cm
- needle: 5 1/4 in; 13.335 cm
- overall 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
- ID Number
- PH.247905
- catalog number
- 247905
- accession number
- 47736
- Credit Line
- U.S. Geological Survey
- See more items in
- Medicine and Science: Physical Sciences
- Surveying and Geodesy
- Measuring & Mapping
- Data Source
- National Museum of American History
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