Photometer
name: label: maker
content: Duboscq, Jules
notes: label: Description
content: The shadow photometer is a simple instrument that was variously attributed to Johann Heinrich Lambert (account was published in 1760), and to Benjamin Thompson, Count Rumford (account appeared in 1794). This unsigned example came from the Smithsonian Castle. It may have been used by Joseph Henry, the physicist who served as founding Secretary of the Smithsonian, who investigated illuminating materials on behalf of the Light House Board. Or, it may have been used by Samuel Pierpont Langley, the astronomer who served as the third Secretary of the Smithsonian.
label: Description
content: Ref: Joseph Henry, “Investigations Relative to Illuminating Materials,” <i>Report of the United States Light-House Board for 1875</i> (Washington, D.C., 1875), pp. 86-103.
label: Description
content: Ref: Joseph Henry, “Investigations Relative to Illuminating Materials,” <i>Report of the United States Light-House Board for 1875</i> (Washington, D.C., 1875), pp. 86-103.
label: Location
content: Currently not on view
place: label: place made
content: France: Île-de-France, Paris
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.314956
label: catalog number
content: 314956
label: accession number
content: 212903
objectType: label: Object Name
content: photometer
physicalDescription: label: Measurements
content: overall: 35 cm x 34.5 cm x 18 cm; 13 3/4 in x 13 9/16 in x 7 1/16 in
label: Measurements
content: overall: 13 3/4 in x 13 7/8 in x 7 3/16 in; 34.925 cm x 35.2425 cm x 18.25625 cm