A jewel for wear by television actors which consists of light-reflecting light-transmitting material. The jewel has cusps with external surfaces which reflect rays of light frontally approaching the jewel at Brewster's angle, thus substantially eliminating or greatly diminishing the amount of reflected...http://www.google.fr/patents/US3979924?utm_source=gb-gplus-shareBrevet US3979924 - Nonreflecting jewels for television broadcasting use
Nonreflecting jewels for television broadcasting use
