Roof Prism
notes: label: Description
content: After the United States declared war on Germany on April 6, 1917, American leaders realized that the best optical instruments came from German shops. Thus, to obtain the spy glasses, binoculars, range finders, and other optical instruments needed by its fighting forces, they commandeered the resources of private optical and instrument shops. And they authorized the establishment of a new optical shop at the Washington Navy Yard. That facility, later termed the Naval Weapons Plant Optical Shop, gave this glass roof prism, for a telescope, to the Smithsonian in 1961.
label: Location
content: Currently not on view
setName: label: See more items in
content: Medicine and Science: Physical Sciences
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: PH.319368
label: catalog number
content: 319368
label: accession number
content: 237036
objectType: label: Object Name
content: Prism, Telescope
physicalDescription: label: Physical Description
content: glass (overall material)
label: Measurements
content: overall: 76 mm x 40 mm x 40 mm; 3 in x 1 9/16 in x 1 9/16 in
label: Measurements
content: overall: 1 9/16 in x 3 in x 1 5/8 in; 3.96875 cm x 7.62 cm x 4.1275 cm