[Doc Ewen looks into the horn antenna, 1950]
Image courtesy of Doc Ewen


Harvard Cyclotron: 1948-1951

Detection of HI Line: 1951

Harvard 24ft and 60ft and NRAO founding: 1952-1956

1950s and 1960s: Two Roads that Crossed

Microwave & Millimeter Wave Applications in the 1970s and 1980s

Mm Wave Radiometry in the 1990s

May 2001 visit to NRAO Green Bank



[Doc Ewen and horn antenna, 2001]
Image courtesy of Doc Ewen

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

by Doc Ewen, © 2003

Slide 6: Detecting the Interstellar Hydrogen Line, 1951

[Shklovski 1948 paper]

First page of English translation 1948 Shklovski paper. In a paper titled "A Monochromatic Radio Emission from the Galaxy and the Possibility of Observing It", originally published in Russian in Astronomicheski Zhurnal SSSR 26 (1), 10-14, 1948, Shklovski said, "The experimental possibilities of detecting this emission are discussed. It is shown that with radio apparatus of present day sensitivity, the said emission will be detected if the gain of the antenna is greater than 65, a value easily attainable." [Photo courtesy of Doc Ewen]

Slide 7
Modified on Monday, 06-Sep-2004 14:10:42 EDT by Ellen Bouton