Photographic Lens
date: label: date made
content: 1870s
name: label: maker
content: Dallmeyer, John Henry
notes: label: Description
content: The “J. H. Dallmeyer / LONDON / No 27423 / S.O. / June 11th Patent (U.S.) 1867” inscription on this 6-inch aperture lens refers to John Henry Dallmeyer (1830-1883), an important optical instrument maker in London. This lens was placed on one of the Transit of Venus equatorial mounts, and used to photograph the solar eclipse of 1878.
label: Description
content: Ref: John Henry Dallmeyer, “Compound Lens for Photographic Portraiture,” U.S. Patent 65,729 (June 11, 1867).
label: Description
content: <i>Reports of Total Solar Eclipses of July 29, 1878, and January 11, 1880</i> (Washington, D.C., 1880), p.31.
label: Location
content: Currently not on view
place: label: place made
content: United Kingdom: England, London
topic: label: Subject
content: Science & Scientific Instruments
setName: label: See more items in
content: Medicine and Science: Physical Sciences
creditLine: label: Credit Line
content: U. S. Naval Observatory
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PH.327712.01
label: catalog number
content: 327712.01
label: accession number
content: 283654
objectType: label: Object Name
content: lens
physicalDescription: label: Measurements
content: overall: 15 1/2 in x 8 1/2 in; 39.37 cm x 21.59 cm