. . . . "In diamond the carbon atoms lie on two interpenetrating face-centred cubic lattices, and each carbon atom of one lattice is surrounded by four carbon atoms of the other arranged tetrahedron-wise." . "empirical-generalization" . . "Related claim (same-quantity): The tetrahedral angle, arccos(-1/3) = 109.47°, appears in both: in diamond as the C-C-C bond angle measured here from the refined structure, in Thompson as the angle between the rays of a four-rayed spicule formed at the junction of four equal cells. In the crystal it is a fact of the lattice; in the spicule it is a claim about cell packing that has not been tested on specimens." . "In diamond each carbon atom is surrounded tetrahedrally by four others on two interpenetrating face-centred lattices" . "\\text{CN}(\\text{C}) = 4,\\ \\angle = 109.47^\\circ" . . "Bragg WH et al., “X Rays and Crystal Structure”, G. Bell and Sons, London (1915); X Rays and Crystal Structure, ch. VIII, p. 108. Scope: Diamond structure." . "Bragg WH, Bragg WL. X Rays and Crystal Structure. G. Bell and Sons, London (1915)" . "William Henry Bragg and William Lawrence Bragg" . "1915"^^ . "First edition, University of Toronto copy." . "Public domain (1915)." . "X Rays and Crystal Structure" . . . . "Reading copy of X Rays and Crystal Structure" . . . "delphisci crystals-and-form claim extractor" . . . . "Claude Fable 5.1" . . . . . . . . . . . . "Page 108 of the reading copy; paragraph 1377 of the normalised text 1915-bragg-book.txt (sha256 61f0ad3ced5e5ea0acb3b9ad17a90be706ce23c8ff5888140b807bea94b3e55d), produced by build/fetch.py and checked by build/check-quotes.mjs. The text itself is not committed." . . . "the carbon atoms are arranged on two interpenetrating face-centred lattices. Each carbon atom of lattice B is surrounded by four carbon atoms belonging to lattice A, arranged tetrahedron-wise, and vice versa" . . "61f0ad3ced5e5ea0acb3b9ad17a90be706ce23c8ff5888140b807bea94b3e55d" . "Checksum of the normalised one-paragraph-per-line text derived from the reading copy, not of the reading copy itself." . "crystals-and-form" . "2026-11-07T06:06:25.499Z"^^ . . . . . . "William Henry Bragg and William Lawrence Bragg 1915 claim: In diamond each carbon atom is surrounded tetrahedrally by four others on two interpenetrating face-centred lattices" . . "RSA" . "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAyFHtPB6p0mCjDozxlOY9CmO3nBm7Te3jFbXyLmM+G1tGe47Da0jYIbhkl9Oo1ZjxmCa3LCwlEqK8gj6hEIcL4ahW30JXh9HycfKVk1bugkzMEV15tJdTzAU3sGMFnbNsn43xY2LFLy45tApkRm5byEiM7oRRrooIdwoQKnP4Wzq/bfAoJ9qvW+MGkelyOTd1jbSt+KfmT7xKmDfWzAHddUlWwMX2QJOLxDaffOteTop6ZRgPiNmPJKA/S62Gac9XtSYT3oDkZ6/nr5cxxNLpOyxTf5FPISiCe11xYO/unYjY+mwnOfA8yhJIyx1l0O9I0vpOpn+E5TvyHJV+oSTrvwIDAQAB" . "J0YGUT4L8UPtwgmlQZ2jVjlhs9z0hkN76kXXTWyxkJxh06Tf3RHp6nYAMNLyyD3gi4K9+xY6mE8yDRhl/hTqN5PUF3xqcmDST1MXwvI5RzKCDGpqQO/l8R3wZMRNrSVsOG4CSl5uDVVgodl/Rmz/YuwqEDuHs/yC/bVISmcIEmSlGCSnk5LuVlnSDUUz6eDjwySaZiOfbXxD3BVN2/b4cuTi9iBtmAptfrEj7aGgX9asn0XsDJXPE3qV9L6da879F+QNu5akTe74YWdwkAzewJ0kepwaFt0g92FY6jLUs0mXWks2bls5sZCeJJfOSG7tmo5o2QoHd/+io4uRLTg2Xg==" . . .