| 单词 | tough pitch |
| 释义 | > as lemmastough pitch tough pitch n. commercially pure copper in which the amount of cuprous oxide was reduced by poling to the value at which it would produce minimum brittleness; usually attributive or as adj. ΘΚΠ society > occupation and work > materials > derived or manufactured material > metal > base metal > [noun] > copper > types of garcopper1654 rose copper1678 tile copper1825 pimple copper1848 blister-copper ore1861 pimple metal1870 tough-cake1881 tough pitch1881 electrolytic1912 1881 Trans. Amer. Inst. Mining Engineers 1880–1 9 187 Tough-pitch, see Tough-cake. 1903 Engineering 4 Dec. 753/3 When the right amount of oxygen is present, the copper is said to be ‘tough-pitch’. 1949 P. C. Carman Chem. Constit. & Prop. Engin. Materials vii. 220 The product is a ‘tough-pitch’ copper of over 99·9% purity. 1964 H. Hodges Artifacts iv. 70 Correctly poled copper, tough pitch copper, still contains a little cuprous oxide. < as lemmas |
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