Assertion: mirror | /r/HasProperty | discovered by william bragg
Facets:
value: in 1932
type: TEMPORAL
Source sentences:
text: Although his explanation of different cooling rates was incorrect, he was right to suggest the surface contained minute variations which the naked eye could not detect; these mirrors also had no transparent quality at all, as discovered by William Bragg in 1932 (after an entire century of their confounding Western scientists).