Word: diffraction
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Dates: during 1930-1939
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...there is a flexible guide to ease the tube's passage, a small light and a prism which protrude on one side. Inside the tube, one above the other, are set more than 40 lenses. No matter which way the tube is bent within the patient, the lenses diffract the image at the bottom of the tube so that the physician has a clear view of the stomach wall as he twists the gastroscope. Insertion of the instrument is easy: the physician anesthetizes the patient's throat, grasps the gastroscope in both hands like a billiard cue, pokes...
...three hours and interpreted in a few minutes. The new method has its greatest usefulness in the study of materials which are opaque to X-rays, as are most metallic crystals. In most of these crystals the plane surfaces of the atoms lying in regular pattern diffract the X-rays within a relatively thin surface layer of the crystal. The method invented by Mr. Greninger is a variation of the method devised by Max Laue, 20 years...
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