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Scientific American, Vol. 68, No. 20 (1893) (1893)
leaf 4
the hole in the in- ancient Scandinavian vessels, models of which are to dex is black-leaded by twirling in it the point of a very be exhibited at Chicago. Our illustration represents Fig. 2.-SENSITIVE HYGROSCOPE. soft lead pencil. one of these models, which has recently sailed for America, after… … into suitable strips or ingots. No flux is required. © 1893 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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