[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

Slides 26-33: Harvard Cyclotron, 1948 to 1951

[Magnet assembled at Watertown Arsenal]

Magnet assembled at Watertown Arsenal, minus coils and pole tips. The center post is a temporary piece.

[Upper coil being lowered into place]

Upper coil being lowered into place.

[Magnet complete]

Magnet complete except for lower pole tip. Tank is supported from the upper pole.

[Main radiation shield]

Main radiation shield, showing the rollers for the doors and part of door frame in foreground.

[Constructing eight foot thick door frame]

Eight foot thick door frame being located on roller carriages.

[Steel frames for east doors ready for concrete]

Steel frames for east doors ready for concrete.

[Swinging door and door operating mechanism]

Inside and outside faces of swinging door; door operating mechanism.

[West doors being moved by crane]

West doors being moved by crane.

Slide 34
Modified on Sunday, 25-Jul-2004 17:59:49 EDT by Ellen Bouton