touch-needle

名詞

A small bar of gold and silver, either pure, or alloyed in some known proportion with copper, for testing the purity of gold or silver articles by comparison of the streaks made by the article and the bar on a touchstone.

日本語の意味

金または銀の純度試験に用いられる小型の金属棒。金や銀が、銅と既知の割合で合金されているか、または純粋な状態かにかかわらず、試金石上で試料と小棒が作る線の比較により、金属の純度を判断するためのもの

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The jeweler rubbed the ring against a touch-needle to compare the streaks and verify its purity.

宝石商は、指輪を金銀の小さな試験棒にこすって、跡を比べて純度を確認した。

詳細

意味（1）

A small bar of gold and silver, either pure, or alloyed in some known proportion with copper, for testing the purity of gold or silver articles by comparison of the streaks made by the article and the bar on a touchstone.

touch-needles （ plural ）