Doc Ewen

Doc Ewen: The Horn, HI, and Other Events in US Radio Astronomy

by Doc Ewen, © 2003

Slide 13: Detecting the Interstellar Hydrogen Line, 1951

[Purcell letter to Shapley]

Ed Purcell's January 1950 letter to Harlow Shapley requesting funds from the Rumford Fund of the American Academy of Arts and Sciences. [Photo courtesy of Doc Ewen]

Slide 14
Modified on by Ellen Bouton