. The Bell System technical journal . Figs. 8, 9—Diffraction-spots (Laue patterns) obtained when a beam in-cluding waves of many wave-lengths is directed against a fixed single crystal. Theseare the historic patterns obtained with X-rays and a zincblende crystal by Friedrichand Knipping. The two correspond to different orientations of the crystal relativeto the primary beam. (IV) If the incident beam is monochromatic or nearly so we canpresent to it not a single stationary crystal but a confused mass oftiny crystals oriented in every way whatever. The desired coincidencewill certainly occur fo
. The Bell System technical journal . Figs. 8, 9—Diffraction-spots (Laue patterns) obtained when a beam in-cluding waves of many wave-lengths is directed against a fixed single crystal. Theseare the historic patterns obtained with X-rays and a zincblende crystal by Friedrichand Knipping. The two correspond to different orientations of the crystal relativeto the primary beam. (IV) If the incident beam is monochromatic or nearly so we canpresent to it not a single stationary crystal but a confused mass oftiny crystals oriented in every way whatever. The desired coincidencewill certainly occur for some among the crystals. This is the powder method invented and applied to X-rays byHull and by Debye and Scherrer, and applied to electron-waves byG. P. Thomson. The term implies that the chaotic mass of littlecrystals is obtained by pulverizing a large one; but small pieces orthin films of ordinary metals are likely to present quite as complete achaos. The diffraction-pattern when formed on the wall of the bulbor on a flat scre
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
