. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 272 CRYSTALLIZATION. adjacent holes to touch it, as indicated by the dotted circles. Above these four more may be placed in the openings a b c d, so as to touch it—making twelve in all. If the pile be completed, we shall get a four-sided pyramid, of which each side is an equilateral triangle, as. represented in Fig. 2. It will be seen that, in these triangular faces, each ball (except,of course, those forming the edges) is touched by six ot
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 272 CRYSTALLIZATION. adjacent holes to touch it, as indicated by the dotted circles. Above these four more may be placed in the openings a b c d, so as to touch it—making twelve in all. If the pile be completed, we shall get a four-sided pyramid, of which each side is an equilateral triangle, as. represented in Fig. 2. It will be seen that, in these triangular faces, each ball (except,of course, those forming the edges) is touched by six others. Again, if we start with such a triangle, as in Fig. 3, where each ball is touched by six others, we can place one ball—the shaded one—so as. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Board of Regents; United States National Museum. Report of the U. S. National Museum; Smithsonian Institution. Report of the Secretary. Washington : Smithsonian Institution
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