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Webster 1913 Edition

Touch-needle

Touch′-neeˊdle

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Noun.
(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 1828 Edition

Touch-needle

TOUCH-NEEDLE

,
Noun.
tuch'-needle. [touch and needle.] Touch-needles are small bars of gold, silver and copper, each pure and in all proportions, prepared for trying gold and silver by the touchstone, by comparison with the mark they leave upon it.

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