Objective Lenses (2)
date: label: date made
content: 1900
name: label: maker
content: Brashear, John A.
notes: label: Description
content: Each of these two telescope objectives is made of quartz and each is held in a brass cell. Each measures 3.5-inches clear aperture, and has a focal length of 50 inches. One is marked “Quartz / cut 90 deg. To axis.” The other is marked “Quartz / april 1900.” These lenses were figured by John A. Brashear, and used to photograph the ultra-violet portion of the chromosphere during the total solar eclipse of May 28, 1900.
label: Description
content: Ref: Lewis E. Jewell, “A Discussion of the Pinehurst Spectrograms,” <i>Publications of the United States Naval Observatory</i> Second Series, Vol. 4, Part 4 (Washington, D.C., 1906), p. D 121.
label: Location
content: Currently not on view
place: label: place made
content: United States: Pennsylvania, Pittsburgh
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: 2005.3085.14
label: catalog number
content: 2005.3085.14
label: nonaccession number
content: 2005.3085
objectType: label: Object Name
content: telescope objectives (2)
label: Object Name
content: quartz telescope objectives (2)
physicalDescription: label: Measurements
content: overall: 4 3/4 in x 5 3/4 in x 4 1/4 in; 12.065 cm x 14.605 cm x 10.795 cm
label: Measurements
content: overall in box: 4 7/8 in x 5 5/8 in x 4 1/8 in; 12.3825 cm x 14.2875 cm x 10.4775 cm