Equilateral Prism
date: label: associated dates
content: 1915 05 14 / 1915 05 14
name: label: maker
content: Hilger, Adam
notes: label: Description
content: This equilateral glass prism was probably owned and used by Henry Draper, the New York physician who did pioneering work in astronomical photography and spectroscopy. The “J. A. HILGER / 192 / TOTTENHAM COURT ROAD / LONDON W.” inscription in the lid of the case is that of Johann Adam Hilger (1839-1867), a German artisan who moved to London around 1870, set up shop at this address in 1875, and dropped his first name soon thereafter.
label: Description
content: Ref. George F. Barker, “Memoir of Henry Draper,” <i>Biographical Memoirs of the National Academy of Sciences</i> (1888), pp. 81-139.
label: Location
content: Currently not on view
place: label: place made
content: United Kingdom: England, London, City of London
label: associated place
content: United States: District of Columbia, Washington
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.314847
label: accession number
content: 58310
label: catalog number
content: 314847
objectType: label: Object Name
content: equilateral prism
label: Object Name
content: Case
physicalDescription: label: Physical Description
content: glass (overall material)
label: Physical Description
content: wood (case material)
label: Physical Description
content: leatherette (case material)
label: Physical Description
content: satin (case material)
label: Physical Description
content: gold leaf (case material)
label: Measurements
content: average spatial: 51 cm x 5.24 cm x 5.24 cm; 20 1/16 in x 2 1/16 in x 2 1/16 in
label: Measurements
content: average spatial: 51 cm x 5.24 cm x 5.24 cm; 20 1/16 in x 2 1/16 in x 2 1/16 in
label: Measurements
content: overall: 2 1/16 in x 2 1/16 in x 2 1/16 in; 5.23875 cm x 5.23875 cm x 5.23875 cm
label: Measurements
content: average spatial; case: 6 cm x 6.9 cm x 6.5 cm; 2 3/8 in x 2 23/32 in x 2 9/16 in
label: Measurements
content: case: 2 1/2 in x 2 5/8 in x 2 3/8 in; 6.35 cm x 6.6675 cm x 6.0325 cm