touch-needle

Touch-needle

Touch"-nee`dle\, n. (Metal.) A small bar of gold and silver, either pure, or alloyed in some known proportion with copper, for trying the purity of articles of gold or silver by comparison of the streaks made by the article and the bar on a touchstone.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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