Vacuum spheres, 1940s

Vacuum spheres, 1940s

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Caption: Vacuum spheres. These spheres are used in conjunction with a hypersonic wind tunnel (not seen). When the wind tunnel is in use, the vacuum in the spheres allows the air to flow through the tunnel at supersonic speeds. Photographed at the National Physical Laboratory, Teddington, UK, in the 1940s.

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Keywords: 1900s, 1940s, 20th century, black-and-white, britain, british, duo, england, english, equipment, historical, history of science, hypersonic tunnel, monochrome, national physical laboratory, npl, outdoors, outside, pair, physical, physics, research, technological, technology, teddington, two, uk, united kingdom, vacuum sphere

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