Model of Magnetic Surface
date: label: date made
content: around 1859
notes: label: Description
content: This is a visual representation of the changes in magnetic declination as observed in the early 1840s by Alexander Dallas Bache, then a professor of natural philosophy at Girard College in Philadelphia, and soon to become director of the U.S. Coast Survey. It was made by Ferdinand Engel, a German artisan who immigrated to the United States around 1848, and found work with the Coast Survey. It was probably made for the Smithsonian Institution, which published Bache's account of his magnetic observations in 1859.
label: Description
content: Ref: A. D. Bache, "Discussion of Magnetic and Meteorological Observations Made at the Girard College Observatory, Philadelphia, from 1840 to 1845," <i>Smithsonian Institution Contributions to Knowledge</i> 11 (1859).
label: Location
content: Currently not on view
place: label: place made
content: United States: District of Columbia
topic: label: Subject
content: Science & Scientific Instruments
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.314745
label: catalog number
content: 314745
label: accession number
content: 210834
objectType: label: Object Name
content: model
physicalDescription: label: Measurements
content: overall: 10 in x 25 13/32 in x 21 3/16 in; 25.4 cm x 64.516 cm x 53.848 cm
label: Measurements
content: overall: 3 3/4 in x 8 3/8 in x 10 in; 9.525 cm x 21.2725 cm x 25.4 cm