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Listening to the maser. This is my favorite photo of that time. Charlie Townes is surrounded by T.C. Wang, a Columbia post doc, Koichi Shimoda from Tokyo University in Japan, Walter Higa from the Jet Propulsion lab, and James Lotspeich, a Columbia grad student. They are listening intently to the relatively pure audio beat note at about 100 Hz produced by combining the outputs of the two masers.

© James Gordon