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Scientific American, Vol. 69, No. 13 (1893) (1893)
leaf 4
er mill, Philadelphia, though during done upon plates of copper, either by means of aqua- FRIEDERICHS & FLIEGE’S INSIDE COVER FOR fortis or the graver, and BARRELS, | sometimes by these two means combined. Itisthe the improvements to beintroduced intoit. They have hollows in the plate that now… … THE WORLD'S COLUMBIAN EXPOSITION—ALEXANDER BROS, LEATHER BELTS, © 1893 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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