Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . ckness of the section and the wavelength. The direction in which it is necessary to turn the analyzer tochange violet into red is the so-called direction of rotation. With Parallel White Light and Crossed Nicols. The shorter the wave length the greater the rotation, that is thedifferent colors are dispersed and on emergence vibrate in differentplanes. As the analyzer is turned its plane of vibration is succes-sively at right angles to the planes of vibration of the differentcolors. That is, at any ti
Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . ckness of the section and the wavelength. The direction in which it is necessary to turn the analyzer tochange violet into red is the so-called direction of rotation. With Parallel White Light and Crossed Nicols. The shorter the wave length the greater the rotation, that is thedifferent colors are dispersed and on emergence vibrate in differentplanes. As the analyzer is turned its plane of vibration is succes-sively at right angles to the planes of vibration of the differentcolors. That is, at any time only one color is shut out completely 170 DESCRIPTIVE MINERALOGY. and the rest in varying degree. The color with vibrations mostnearly parallel to the vibration planes of the analyzer will be leastshut out and will determine the predominating tint in the resultantcolor. Fig. 362 shows the rotations produced by a quartz plate of thickness. The vibration plane of yellow is; for this thick-ness, at right angles to PS, the vibration plane of the incident light. Fig. 362. Fig.
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