Ewen-Purcell Horn Antenna Marker

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Green Bank in Pocahontas County, West Virginia — The American South (Mid-Atlantic)

Ewen-Purcell Horn Antenna

By Bernard Fisher, August 7, 2012

1. Ewen-Purcell Horn Antenna Marker

Inscription. This horn antenna was used by Harold I. Ewen and Edward M. Purcell at the Lyman Laboratory of Physics at Harvard University in 1951 for the first detection of radio radiation from neutral atomic hydrogen gas in the Milky Way at a wavelength of 21 centimeters

Location. 38° 25.891′ N, 79° 49.085′ W. Marker is in Green Bank, West Virginia, in Pocahontas County. Marker can be reached from West Virginia Route 28/92 east of Cemetery Road (County Route 28/25), on the right when traveling south. Click for map. Located at the National Radio Astronomy Observatory. Marker is in this post office area: Green Bank WV 24944, United States of America.

Other nearby markers. At least 8 other markers are within 8 miles of this marker, as the crow flies. Camp Allegheny (approx. 5.9 miles away); Highland County / West Virginia (approx. 7.1 miles away in Virginia); War In West Virginia (approx. 7.1 miles away); The Great Raid (approx. 7.1 miles away); Staunton-Parkersburg Turnpike (approx. 7.1 miles away); a different marker also named Camp Allegheny (approx. 7.1 miles away); West Virginia / Virginia (approx. 7.1 miles away); a different marker also named Camp Allegheny (approx. 7.2 miles away in Virginia).

Also see . . . National Radio Astronomy Observatory. (Submitted on August 11, 2012, by Bernard Fisher of Mechanicsville, Virginia.)

Ewen-Purcell Horn Antenna Photo, Click for full size

By Bernard Fisher, August 7, 2012

2. Ewen-Purcell Horn Antenna

Credits. This page originally submitted on August 11, 2012, by Bernard Fisher of Mechanicsville, Virginia. This page has been viewed 92 times since then. Photos: 1, 2. submitted on August 11, 2012, by Bernard Fisher of Mechanicsville, Virginia.