Telescopic Aildade
Telescopic Aildade
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- Description
- This alidade has an inverting telescope, and a vertical arc that is silvered, graduated to 20 minutes, and read by vernier to single minutes. The pedestal is painted maroon. The base, also maroon, has floral decorations at either end, a circular level vial, and a beveled edge with an 18-inch scale that is divided to fiftieths of an inch. The U. S. Geological Survey transferred it to the Smithsonian in 1907, describing it as a "preliminary type" of alidade devised for the Survey about 1890.
- Location
- Currently not on view
- Object Name
- Alidade (Telescopic)
- Measurements
- base: 18 1/2 in; 46.99 cm
- telescope: 11 in; 27.94 cm
- overall: 8 1/8 in x 18 5/8 in x 3 3/4 in; 20.6375 cm x 47.3075 cm x 9.525 cm
- ID Number
- PH.247912
- catalog number
- 247912
- 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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