Lens
notes: label: Description
content: Achromatic objective lens—9.6 inches aperture and 14.25 feet focal length—made by Merz & Mahler for the 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.
label: Location
content: Currently not on view
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.327703
label: catalog number
content: 327703
label: accession number
content: 283654
objectType: label: Object Name
content: lens
physicalDescription: label: Measurements
content: overall: 2 3/4 in x 11 3/4 in; 6.985 cm x 29.845 cm
label: Measurements
content: overall: 3 in x 11 3/4 in; 7.62 cm x 29.845 cm