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Scientific American, Vol. 56, No. 15 (1887) (1887)
leaf 3
lly effected.—Pharmaceutical never mislaid, and there is no waste of the thread. 4 sq. ft.; weight (loaded), 10 tons ; Journal. Simple Test for Gold. Take a piece of flint and rub against it the me- tallic object to be tested, until the latter leaves a suffi- ciently marked trace upon the stone.… … © 1887 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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