Micrometer

Micrometer

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Description
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.
Location
Currently not on view
Object Name
Eyepiece micrometer, divided lens
date made
1874
maker
Alvan Clark & Sons
Measurements
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
2005.0172.09
accession number
2005.0172
catalog number
2005.0172.09
See more items in
Medicine and Science: Physical Sciences
Data Source
National Museum of American History
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