. The Bell System technical journal . ncident beam is a mixture of wave-lengths covering avery wide range, we can keep the crystal motionless and the directionof incidence constant, and yet count on the coincidence turning upfor some of the wave-lengths (Figs. 8, 9, 10, 11 and 12). This is Laues method, the first to be applied to the analysis ofcrystal structure, and the one whereby it was first proved that X-raysare waves—as people said at the time, which was 1912. Nowadays CONTEMPORARY ADVANCES IN PHYSICS 407 we say that it was proved that X-rays possess some of the qualitiesof waves. To mak
. The Bell System technical journal . ncident beam is a mixture of wave-lengths covering avery wide range, we can keep the crystal motionless and the directionof incidence constant, and yet count on the coincidence turning upfor some of the wave-lengths (Figs. 8, 9, 10, 11 and 12). This is Laues method, the first to be applied to the analysis ofcrystal structure, and the one whereby it was first proved that X-raysare waves—as people said at the time, which was 1912. Nowadays CONTEMPORARY ADVANCES IN PHYSICS 407 we say that it was proved that X-rays possess some of the qualitiesof waves. To make the spots appear a fluorescent coat or a photographic filmis spread on a flat screen, instead of the spherical bulb. The locationson the screen can be deduced from those on the imaginary bulb bysimple projection. Different spots are likely to be due to componentsof different wave-length in the primary beam, which will probablynot be equally intense—a thing to be remembered when deducing thediffraction-pattern of the
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
