[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 18-24: Harvard Cyclotron, 1948 to 1951

[Magnetic shunt on bench]

Magnetic shunt on bench


[Magnetic shunt mechanical tuning mechanism]

Magnetic shunt mechanical tuning mechanism.


[Tuning mechanism for the forth section of the channel]

Tuning mechanism for the forth section of the channel.


[Exit end of magnetic channel]

Exit end of magnetic channel.


[Forth channel of tuning mechanism installed in cyclotron]

Forth channel of tuning mechanism installed in cyclotron.


[Mechanical tuning of shunt position]

Mechanical tuning of shunt position.


[Magnetic shunt entrance]

Magnetic shunt entrance.

Slide 25
Modified on Sunday, 25-Jul-2004 17:38:12 EDT by Ellen Bouton