Binocular Telescope

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This is a brass instrument with center focus, and center adjustment for inter-ocular distance. The objective lenses are 40 mm diameter. The length is 29 cm (closed). Each eye tube is marked “LEVY, DREYFUS & CO / NEW YORK.” These came to the Smithsonian in 1907. A note in the file reads: “Prussian Army Field Glass used in 1885 by the [U.S.] Geological Survey but now discarded because of the small field of view.
Levy, Dreyfus & Co. was in business in New York City in the 1890s, advertising as opticians and as wholesale importers.
Currently not on view
date made
ca 1880
overall: 2 3/8 in x 11 1/2 in x 4 13/16 in; 6.0325 cm x 29.21 cm x 12.22375 cm
ID Number
catalog number
accession number
Credit Line
U.S. Geological Survey
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Medicine and Science: Physical Sciences
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Data Source
National Museum of American History