. . . . "Median cell edge a over COD entries with formula Cl Na in Fm-3m passing the ambient filter; d(200) = a/2 compared with the claimed 2.81 angstrom." . . "Measured: 2.83175 d(200) of NaCl, median over ambient Fm-3m COD cells (angstrom) (n = 35). Interpretation: Bragg's 2.81 came from the density, the molecular weight and an estimate of the hydrogen atom's mass; the modern cell comes from diffraction against a known wavelength. The test is of the number, not the method." . "Claim test of bragg1915-01: supports, confidence 0.9" . . . "Planned datasets: cod-search-api" . "claim-test/0.1.0" . "physical" . "Relative difference above 0.03: refutes. Between 0.01 and 0.03: mixed. Fewer than 3 qualifying entries: inconclusive." . "A thermal-expansion series with empty celltemp fields inflates the median a to 5.66 angstrom (room temperature 5.640); the verdict does not depend on it." . "Median a over COD entries with formula Cl Na, space group F m -3 m, ambient conditions as above, Z = 4: |2.81 - a/2| / (a/2) < 0.01: supports." . "Relative difference above 0.03: refutes. Between 0.01 and 0.03: mixed. Fewer than 3 qualifying entries: inconclusive." . "0.9"^^ . . "supports" . "If the spacing of the cube-face planes of rock salt is 2.81 x 10^-8 cm, modern refinements of NaCl at ambient conditions give d(200) = a/2 within one per cent of 2.81 angstrom." . "Median cell edge a over COD entries with formula Cl Na in Fm-3m passing the ambient filter; d(200) = a/2 compared with the claimed 2.81 angstrom." . "Median a over COD entries with formula Cl Na, space group F m -3 m, ambient conditions as above, Z = 4: |2.81 - a/2| / (a/2) < 0.01: supports." . "true"^^ . . "" . "CC0 (COD data are public domain)" . . "Dataset: Crystallography Open Database (COD) search API and CIF files" . . . "sha256:8dd722386f6120e5234e7ea64cde68e5cd796094c31db425520bb93e5160b8c0" . . "delphisci claim tester (claude-fable-5.1; crystals-and-form-tests-1)" . . . "claude-fable-5.1" . . . . . . . . . "2026-11-08T16:24:31.803Z"^^ . . . . . "Claim test of bragg1915-01: supports, confidence 0.9" . . "RSA" . "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAyFHtPB6p0mCjDozxlOY9CmO3nBm7Te3jFbXyLmM+G1tGe47Da0jYIbhkl9Oo1ZjxmCa3LCwlEqK8gj6hEIcL4ahW30JXh9HycfKVk1bugkzMEV15tJdTzAU3sGMFnbNsn43xY2LFLy45tApkRm5byEiM7oRRrooIdwoQKnP4Wzq/bfAoJ9qvW+MGkelyOTd1jbSt+KfmT7xKmDfWzAHddUlWwMX2QJOLxDaffOteTop6ZRgPiNmPJKA/S62Gac9XtSYT3oDkZ6/nr5cxxNLpOyxTf5FPISiCe11xYO/unYjY+mwnOfA8yhJIyx1l0O9I0vpOpn+E5TvyHJV+oSTrvwIDAQAB" . "HsvQpveflptuYvFhotgpWJeubBUxAZQiU4pdRv1qB1mZ8r4tTV1ok0565wZijyg4mruliVTweiYii+waXAQB6jwff0UctZuifQzHU96IVuZdIkyJqfQTvUl7sJowhTbnsJzGiEm59E4+0g0yv3myW3c9CHyP6oxCbLVRmp3BJmRSdmBiHWiX8Q9pfwze4CrCtmDLMItlK7qAAi/OTKY//ZSRnB8+tpsa57FCEKFMHDGrMLmKxDlPU3O/UIA3wKXD5gd6JpcZh+Uiwn1iWUdHASS0OPdevfwuCPEqaTnl9jvtYBU9fIa4AAMhutKuP7ufC+GBhEQVO3XlMz9nR7lpYg==" . . .