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单词 hard lead
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hard lead
hard lead n. [originally after German †hart Bley (1574 (in the passage translated in quot. 1683) or earlier; now Hartblei)] a lead alloy containing a small amount of antimony (which makes it harder than pure lead).
ΚΠ
1683 J. Pettus tr. L. Ercker iii. xvii. 259 (heading) in Fleta Minor i. Six additional Instructions about proving of fresh Oar, called Hard Lead [Ger. hart Bley].
1881 Trans. Amer. Inst. Mining Engineers 1880–1 9 144 Hard lead, lead containing certain impurities, principally antimony.
2006 A. F. Castle tr. M. Bauser et al. Extrusion (ed. 2) v. 198/1 Lead antimony alloys are referred to as hard lead because the antimony significantly hardens the soft lead.
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