Lens

Lens

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Description
This achromatic lens—9.6 inches aperture and 14.25 feet focal length—was made by Merz & Mahler for the great equatorial refracting telescope installed in the U.S. Naval Observatory in 1845. Alvan Clark & Sons reworked the lens in 1862, improving its color correction and definition. The telescope remained in use until 1896.
Location
Currently not on view
Object Name
lens
Measurements
overall: 2 3/4 in x 11 3/4 in; 6.985 cm x 29.845 cm
overall: 3 in x 11 3/4 in; 7.62 cm x 29.845 cm
ID Number
PH.327703
catalog number
327703
accession number
283654
Credit Line
U. S. Naval Observatory
subject
Science & Scientific Instruments
See more items in
Medicine and Science: Physical Sciences
Data Source
National Museum of American History
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