No human eye has ever seen a breeze. But two physicists recently produced a photograph of one. They announced a high-speed photography technique by which they have made unusually sensitive pictures of air currents, heat waves, sound waves.
The inventors, Norman F. Barnes and S. Lawrence Bellinger of General Electric Co., showed a picture of the air disturbances at the muzzle of a gun at the moment of firing (see cut). The knots near the muzzle are the hot, expanding gases expelled from the barrel. The long, dark, curved line ahead of them is the "shock wave" of compressed air created when...
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