Objective Lens
date: label: date made
content: 1905
name: label: maker
content: Brashear, John A.
notes: label: Description
content: John A. Brashear made this long-focus triplet of 7.5 inches aperture and 65 feet focal length for the U.S. Naval Observatory. The lens was taken to Porto Coeli, in southern Spain, and used to photograph the corona during the solar eclipse of 1905. An inscription on the wooden box reads “7 ½ in Objective Triple Combination / US Naval Ob’sy / Washington, D.C. / J.A. Brashear Co. Ltd. / Allegheny, Pa.” A paper tag reads “7.5 in. 65 feet, 1905.” A plate on the brass cell reads “John A. Brashear Co., Ltd. Allegheny, Pa.”
label: Description
content: Ref: Colby M. Chester, “General Report of the Eclipse Expedition in 1905,” <i>Publications of the U.S. Naval Observatory</i>, Second Series, vol. 10 (1926): B11-B13.
label: Location
content: Currently not on view
place: label: place made
content: United States: Pennsylvania, Pittsburgh, Allegheny City
topic: label: Subject
content: Science & Scientific Instruments
setName: label: See more items in
content: Medicine and Science: Physical Sciences
creditLine: label: Credit Line
content: Transferred from the United States Naval Observatory
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 2005.0172.01
label: accession number
content: 2005.0172
label: catalog number
content: 2005.0172.01
objectType: label: Object Name
content: Objective Lens in Brass Cell, 7.5 inch triplet
physicalDescription: label: Measurements
content: overall: 5 1/2 in x 13 3/4 in x 14 3/4 in; 13.97 cm x 34.925 cm x 37.465 cm
label: Measurements
content: overall: 5 1/2 in x 13 3/4 in x 14 1/8 in; 13.97 cm x 34.925 cm x 35.8775 cm