Elements of natural philosophy (Volume 2-3) . Illustrations; 358 NATURAL PHILOSOPHY Fte. 109. Illustrations;. vibrations that ^e clyStal, for these vibrations, in the one case coincidesresoled; with the plane of primitive polarization, and in the other is perpendicular to it. These waves, therefore, will be reflect-ed, or not, from the analyzer, according as the plane ofreflexion there coincides with, or is perpendicular to, theplane of first reflexion. In the latter case, a hlacJc crosswhite or black will be displayed on the screen, and in the former a white that But the case i
Elements of natural philosophy (Volume 2-3) . Illustrations; 358 NATURAL PHILOSOPHY Fte. 109. Illustrations;. vibrations that ^e clyStal, for these vibrations, in the one case coincidesresoled; with the plane of primitive polarization, and in the other is perpendicular to it. These waves, therefore, will be reflect-ed, or not, from the analyzer, according as the plane ofreflexion there coincides with, or is perpendicular to, theplane of first reflexion. In the latter case, a hlacJc crosswhite or black will be displayed on the screen, and in the former a white that But the case is different with the vibrations whichwm be resolved; emerge at any 0ther point, such as L. The principal section of the crystal for these vibrations, neither coincideswith, nor is perpendicular to, the plane of primitive po-larization ; and consequent-ly the incident polarizedwave will be resolved intotwo, within the crystal,whose planes of polariza-tion are respectively paral-lel and perpendicular tothe principal section 0 vibrations in these two waves are reduced to the same plane by means of the
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