First Measurements of Hydrogen Absorption in the Spectrum of a Radio Source

First Measurements of Hydrogen Absorption in the Spectrum of a Radio Source

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Description
Paper graph showing hydrogen absorption in the spectrum of a radio source, obtained with the 50-foot radio telescope at the Naval Research Laboratory in Washington, D.C.
Ref: John Peter Hagen, A. Edward Lilley, and Edward F. McClain, "Absorption of 21-CM Radiation by Interstellar Hydrogen," The Astrophysical Journal 122 (Nov. 1955): 361-374.
Location
Currently not on view
Object Name
graph
Measurements
overall: 9 1/2 in x 12 in; 24.13 cm x 30.48 cm
ID Number
PH.325761
catalog number
325761
accession number
257196
See more items in
Medicine and Science: Physical Sciences
Data Source
National Museum of American History
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