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单词 head-tin
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head-tin
head-tin n. Mining Obsolete the purest tin ore obtained during a process of mechanical concentration; cf. sense 52 and heading n. 15.
ΚΠ
1673 J. Ray Coll. Eng. Words 122 The head tin passes to the wreck, where they work it with a wooden rake in Vessels.
1753 Chambers's Cycl. Suppl. (at cited word) When the [tin] ore has been pounded and twice washed, that part of it which lies uppermost or makes the surface of the mass in the tub, is called the Head-tin.
1858–9 J. Weale Rudim. Dict. Terms Archit. (ed. 2) 221/2 Head-tin, a preparation of tin-ore towards the fitting it for working into metal.
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