Mirror
notes: label: Description
content: Under the leadership of Charles Greeley Abbott, the Smithsonian Astrophysical Observatory established several stations for charting fluctuations of the solar constant. One station, on Table Mountain in California, opened in 1925 and remained in operation for years. Another, on Mount St. Katherine in Eqypt, ran from 1933 to 1937.
label: Description
content: This speculum metal mirror has a tag that reads “Table mountain equipment received from RBL" and an inscription that reads: "Lower at St. Katharine." RBL here indicates the Radiation Biology Laboratory, an offshoot of the Smithsonian Astrophysical Observatory. Speculum metal is an alloy of copper and tin that can be polished to give a highly reflective surface.
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: ZZ.RSN79557911
objectType: label: Object Name
content: mirror, speculum
physicalDescription: label: Measurements
content: overall: container: 2 3/4 in x 11 1/2 in x 11 1/2 in; 6.985 cm x 29.21 cm x 29.21 cm
label: Measurements
content: overall: p7147: 25 in x 72 in x 48 in; 63.5 cm x 182.88 cm x 121.92 cm