Objective Lens
date: label: date made
content: 1865
name: label: maker
content: Pistor & Martins
label: maker
content: Alvan Clark & Sons
notes: label: Description
content: The U.S. Naval Observatory acquired a transit circle made by Pistor & Martins in Berlin, in 1865, and asked Alvan Clark & Sons to rework its 8.5-inch achromatic objective soon thereafter. This is probably that lens.
label: Location
content: Currently not on view
place: label: place made
content: Germany: Berlin, Berlin
label: place made
content: United States: Massachusetts, Cambridgeport
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: 2005.0172.06
label: accession number
content: 2005.0172
label: catalog number
content: 2005.0172.06
objectType: label: Object Name
content: objective lens
physicalDescription: label: Measurements
content: overall: 2 1/4 in x 12 3/16 in; 5.715 cm x 30.988 cm
label: Measurements
content: overall: 2 in x 12 1/4 in; 5.08 cm x 31.115 cm