Bragg, William Henry, Sir, 1862-1942, Bragg, William Lawrence, Sir, 1890-1971 · London : G. Bell · leaf 48
none position, and if it moved would soon cease to seeany reflections at all. Let PQ in Fig. 9 represent the crystal face re-flecting the ray OP of a certain wave length alongPD, as in Fig. 8. Suppose that at Q there is asmall crystal element set at a slight angle to the face THE X-RAY SPECTROMETER… … Fig. 9. in the position PRT. Consequently the face of thereflecting element at Q must be parallel to PR, andthe reflected ray QD must be parallel to RD. Let OP = Z, PQ = I. Draw QN perpendicular toRD. The triancrles OOP and POR are similar,for they have a common angle at O, and theangles PRQ and…
Crystallography · X-rays
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