Lectures on light, delivered in the United States in 1872-'73; with an appendix (1873)
Tyndall, John, 1820-1893 · New York, Appleton · leaf 92
forces predominate. But they carry on a gradualstruggle with the force of contraction until the freezingtemjDerature is attained. Here the polar forces sudden- CHANGES OF VOLUME. 87 \y and finally gain the victory. The molecules closeup and form solid crystals, a considerable augmentationof volume… … gen, united to one of oxygen. We may assume themolecule built up of these atoms to be pyramidal. Sup-pose the triangles in Fig. (8) to be drawn touching thesides of the molecule, and the disposition of the polar 88 LECTURES ON LIGHT. forces to be that indicated by the letters; the pointsmarked A…
Optics
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