- In an effort to get a better fix on the distance between the Earth and the Sun, the United States sponsored and equipped eight parties to observe the 1874 transit of Venus across the face of the sun. This split lens micrometer, #863, is part of that equipment. It was made by Alvan Clark & Sons, and used with a 5-inch aperture refracting telescope also made by that firm.
- Currently not on view
- Object Name
- Eyepiece micrometer, divided lens
- date made
- Alvan Clark & Sons
- overall: 7 1/2 in x 4 1/2 in x 3 3/4 in; 19.05 cm x 11.43 cm x 9.525 cm
- overall: 7 1/4 in x 4 5/8 in x 3 3/4 in; 18.415 cm x 11.7475 cm x 9.525 cm
- ID Number
- accession number
- catalog number
- See more items in
- Medicine and Science: Physical Sciences
- Data Source
- National Museum of American History
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