Doc Ewen

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

by Doc Ewen, © 2003


Slide 27: Detecting the Interstellar Hydrogen Line, 1951

[Doc Ewen and receiver]

The classic "S-curve" of the switch frequency receiver. Copy of data record obtained on April 9, 1951, about two weeks after first detection. [Photo courtesy of Doc Ewen]

Slide 28
Modified on by Ellen Bouton