Photographic Lens

Photographic Lens

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Description
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.
Ref: John Henry Dallmeyer, “Compound Lens for Photographic Portraiture,” U.S. Patent 65,729 (June 11, 1867).
Reports of Total Solar Eclipses of July 29, 1878, and January 11, 1880 (Washington, D.C., 1880), p.31.
Location
Currently not on view
Object Name
lens
date made
1870s
maker
Dallmeyer, John Henry
place made
United Kingdom: England, London
Measurements
overall: 15 1/2 in x 8 1/2 in; 39.37 cm x 21.59 cm
ID Number
PH.327712.01
catalog number
327712.01
accession number
283654
Credit Line
U. S. Naval Observatory
subject
Science & Scientific Instruments
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Medicine and Science: Physical Sciences
Data Source
National Museum of American History
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