| 单词 | proof needle |
| 释义 | > as lemmasproof needle ΚΠ 1683 J. Pettus tr. L. Ercker i. xxiv. 63 in Fleta Minor i The silver Touch-Needles (which are also called Proof-Needles). 1727 R. Bradley Houghton's Coll. for Improvem. Husbandry & Trade II. 170 How touch or proof needles for silver are to be made. 1825 ‘J. Nicholson’ Operative Mechanic 766 Assayers make a comparison upon a touch~stone, between it and certain needles composed of gold and silver,..which are called Proof Needles. 1849 H. M. Noad Lect. Electr. (ed. 3) 285 Suspending a small proof needle, with a silk fibre, and causing it to oscillate horizontally opposite different points of a magnetic bar placed vertically. < as lemmas |
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