“topit”的英英意思

单词	topit
释义	topit|ˈtɒpɪt| [app. f. phrase top it (top v.1).] An attachment at the top of a boring rod by means of which it is withdrawn. 1839Ure Dict. Arts 966 The boring tools..13. The topit, or top-piece.Ibid., The runner, for taking hold of the topit.1883Gresley Gloss. Coal Mining, Topit, a kind of bracehead, but much smaller, which is screwed on to the top of boring rods when withdrawing them from the hole. It is attached to a rope worked from a jack-roll.

　

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