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Micrometer

Micrometer

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Description
This micrometer for celestial photographs dates from around 1871. In use, the photographic plate was held horizontally and seen through two microscopes. For rectangular coordinates, the microscope is moved back and forth. For position angles, the plate and its bed are rotated. Some original parts have been lost.
This was designed by Lewis Morris Rutherfurd (1816-1892), a wealthy New Yorker who made important contributions to astronomical photography and spectroscopy. It ended up in the observatory at Columbia University.
Ref: “Micrometer,” The American Cyclopaedia (New York, 1875), vol. 11, p. 512.
Deborah Jean Warner, “Lewis M. Rutherfurd: Pioneer Astronomical Photographer and Spectroscopist,” Technology and Culture 12 (1971): 190-216.
Location
Currently not on view
Object Name
Micrometer
date made
around 1871
place made
United States: New York, New York City
Measurements
overall: 18 in x 14 in x 10 1/2 in; 45.72 cm x 35.56 cm x 26.67 cm
overall: 18 5/16 in x 13 1/2 in x 11 in; 46.51375 cm x 34.29 cm x 27.94 cm
ID Number
PH.335216
accession number
315390
catalog number
335216
subject
Science & Scientific Instruments
See more items in
Medicine and Science: Physical Sciences
Data Source
National Museum of American History
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