Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 605
(a) Cubical blocks with holes and pegs for use n buildini? crystal models. Holes in thecenter of each face, the center of each edge and each corner. (6) The axial symmetries of sucha system, four and three fold. (c) Part of a cubic centered structure. (</) Simple cubic,(e) Tetrahedral form of/.…
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