| 释义 |
baryta Chem.|bəˈraɪtə|
Also (obs.) barita.
[f. next: see quot. Cf. also baria.]
a. The protoxide of barium; an alkaline earth distinguished by its great weight.
1809Young in Phil. Trans. XCIX. 151 Phosphate of barita. Ibid. 154 Barytes, as a single Greek word, means weight..but as the name of a stone, accented on the second syllable, it must be written barites; and the pure earth may properly be called barita. 1812Sir H. Davy Chem. Philos. 338 Witherite, or carbonate of baryta.
attrib.1877W. Thomson Voy. Challenger I. i. 26 Baryta-water of known strength.
b. Special Comb. baryta paper, paper coated with an emulsion of barium sulphate; baryta white = permanent white (see permanent a. 1 d).
1900Photogr. Ann. 235 Baryta Paper, (Faced Paper)..Fine paper, faced with an emulsion of barium sulphate, rendered partly insoluble by chrome alum. 1954Spalding & Hodge's Paper Terminol. 13 Baryta Paper, a form of metallic paper on which marks can be made with a metal point or stylus... It..is used in certain types of automatic recording apparatus.
1885Encycl. Brit. XIX. 86/2 Baryta White..is prepared by grinding to a fine powder the pure white native sulphate of baryta (heavy spar). 1886H. C. Standage Artists' Man. Pigments i. 1 Baryta White (also known as Constant or Permanent White). |