| 单词 | brazilian pebble |
| 释义 | > as lemmasBrazilian pebble Brazilian pebble n. now historical a pure variety of rock crystal (quartz) obtained from Brazil and formerly used for making lenses; a stone consisting of this; a lens made of this. ΚΠ 1856 Ladies' Repository May 287/2 Carefully dusting the Brazilian pebble glasses of his gold-rimmed spectacles. 1862 Catal. Internat. Exhib., Brit. No. 2887 Lump of Brazilian pebble, from which slabs are cut and ground into spectacle eyes. 1867 Sci. Amer. 2 Nov. 280/3 The Brazilian pebble is highly esteemed because it is harder than glass and not so liable to be scratched. It has a lower dispersive power than other pebbles and than many glass lenses. 1889 Cent. Dict. at Brazilian Brazilian pebbles, lenses for spectacles ground from pure, colorless rock-crystal obtained from Brazil. 1889 G. M. Hopkins Exper. Sci. xii. 242 Brazilian pebble spectacle lenses often show gorgeous colors when turned at different angles in the beam of polarized light. 1891 Science 27 Nov. 302/1 In the State of Goyaz, in the Sierra dos Cristaes (Crystal Range) are found in abundance the well-known ‘Brazilian pebbles’, whose pure quartz is employed in the manufacture of lenses and spectacles. < as lemmas |
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