- In an effort to get a better fix on the distance between the Earth and the Sun, the United States sponsored eight parties to observe the 1874 transit of Venus across the face of the sun, and equipped each with apparatus made by Alvan Clark & Sons. This 5-inch aperture achromatic lens in a brass cell was the objective for one of the eight equatorial refractors. The inscription on the cell reads “VII / 861”. This was sent to Whangaroa, Chatham Island for the 1874 transit of Venus, and to Aukland, New Zealand, for the 1882 transit of Venus.
- Ref: Simon Newcomb, ed., Observations of the Transit of Venus, December 8-9, 1874 (Washington, D.C., 1880), p. 16.
- Currently not on view
- Object Name
- telescope objective lens
- date made
- Alvan Clark & Sons
- place made
- United States: Massachusetts, Cambridgeport
- overall: 1 1/2 in x 6 3/16 in; 3.81 cm x 15.748 cm
- overall: 1 7/16 in x 6 1/8 in; 3.65125 cm x 15.5575 cm
- ID Number
- catalog number
- nonaccession number
- Science & Scientific Instruments
- See more items in
- Medicine and Science: Physical Sciences
- Data Source
- National Museum of American History
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