touchstone

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References in classic literature ?
One morning (it was a FETE, and we had the day to ourselves) Frances said to me, with a suddenness peculiar to her when she had been thinking long on a subject, and at last, having come to a conclusion, wished to test its soundness by the touchstone of my judgment:--
The first palace is entirely composed of rock crystal, the second of bronze, the third of fine steel, the fourth of another and more precious species of bronze, the fifth of touchstone, the sixth of silver, and the seventh of solid gold.
The Baby's head was, as it were, a test and touchstone for every description of matter,--animal, vegetable, and mineral.
Recognizing our position in these environments, NAVICP-OF/NAVSUP 07 has developed a strategic business plan that serves our constituencies, using touchstones that keep us focused on the main thing, delivering combat capability, through robust logistics support, to our allies.