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Description
Development of a Doppler radar system by Stanford professor William W. Hansen, and Russell and Sigurd Varian, took place in room 404 of the Physics Building, Stanford University, 1939. Klystron tubes shown in the laboratory are the Model F transmitter and receiver. The first transmission signals were received across this room. This photograph is featured on page 152 of Jane Morgan's "Electronics in the West" with caption: "Klystron development took place in this physics laboratory at Stanford. The tubes are the highest objects on tables, vacuum pumps are below. After 17 months' work, the invention was announced to the public, 1939."
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