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

Introduction

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

Bibliography

Permissions


[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

Slides 29-30: Detecting the Interstellar Hydrogen Line, 1951

[Letter from Purcell to Pawsey]

Slide 29: Page 1 of letter from Purcell to Pawsey, May 9, 1951, describing the equipment, the results, and future equipment needs. [Photo courtesy of Doc Ewen]

[Letter from Purcell to Pawsey]

Slide 30: Page 2 of letter from Purcell to Pawsey, May 9, 1951. Purcell says, "I think we ought to send a letter to the Physical Review or Nature (probably the latter) fairly soon.... We will allow time for a reply to this letter before sending anything off." [Photo courtesy of Doc Ewen]

Slide 31
Modified on Monday, 06-Sep-2004 14:17:35 EDT by Ellen Bouton