[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

Harvard 60' Telescope Slides

The day of the 60' Radio Telescope dedication was the beginning of the end of an era of regional competition. It was the beginning of the NRAO. The first eighteen slides show the construction process and the assembly of the 60' antenna in the days just before dedication. The last ten slides show the 60' dedication day. Most of the speakers were actively engaged at that time with the NRAO initiative, which would become a reality that fall (November 17, 1956). The importance of a national observatory was a common thread in all of the presentations.

(Click on the thumbnails for larger photos and fuller explanations.)

Slide 1: Site preparation and concrete work.
Slide 2: Foundation.
Slide 3: Construction at D.S. Kennedy.
Slide 4: Construction at D.S. Kennedy.
Slide 5: Pedestal construction, late March 1956.
Slide 6: Pedestal construction, late March 1956.
Slide 7: Agassiz site in early April 1956; installation of hour angle drive housing.
Slide 8: Installation of torque tube and counterweight.
Slide 9: Telescope ten days before dedication.
Slide 10: Telescope drive.
Slide 11: Installation of reflector.
Slide 12: Fastening last of 24 tip sections.
Slide 13: Block diagram for model 1044 radio telescope.
Slide 14: Receiver and recorder console.
Slide 15: Jack Campbell working on the 1044 radiometer.
Slide 16: Telescope a few days before dedication.
Slide 17: Newspaper articles about the forthcoming dedication.
Slide 18: The telescope, Doc Ewen, and Bart Bok on the day before the dedication.
Slide 19: Agassiz Telescope dedication plate and portrait of George R. Agassiz.
Slide 20: Agassiz Telescope dedication program, April 28, 1956.
Slide 21: Agassiz Telescope dedication program, April 28, 1956.
Slide 22: Completed telescope; Bart Bok speaking at dedication.
Slide 23: Doc Ewen speaking at dedication.
Slide 24: CSIRO Radiophysics Laboratory Chief Taffy Bowen speaking at dedication.
Slide 25: Harvard President Pusey speaking at dedication.
Slide 26: Alan Waterman, NSF Director, and Donald Menzel, Harvard Observatory Director.
Slide 27: Dedication day.
Slide 28: Doc Ewen and Ed Purcell with horn antenna at 60' dedication.

Modified on Friday, 28-Jan-2005 11:41:33 EST by Ellen Bouton