Micrometer
date: label: date made
content: around 1871
notes: label: Description
content: 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 are lost.
label: Description
content: 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.
label: Description
content: Ref: “Micrometer,” <i>The American Cyclopaedia</i> (New York, 1875), vol. 11, p. 512.
label: Description
content: Deborah Jean Warner, “Lewis M. Rutherfurd: Pioneer Astronomical Photographer and Spectroscopist,” <i>Technology and Culture</i> 12 (1971): 190-216.
label: Location
content: Currently not on view
place: label: place made
content: United States: New York, New York City
topic: label: Subject
content: Science & Scientific Instruments
setName: label: See more items in
content: Medicine and Science: Physical Sciences
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PH.335216
label: accession number
content: 315390
label: catalog number
content: 335216
objectType: label: Object Name
content: Micrometer
physicalDescription: label: Measurements
content: overall: 18 in x 14 in x 10 1/2 in; 45.72 cm x 35.56 cm x 26.67 cm
label: Measurements
content: overall: 18 5/16 in x 13 1/2 in x 11 in; 46.51375 cm x 34.29 cm x 27.94 cm