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Scientific American, Vol. 33, No. 7 (1875) (1875)
leaf 7
ic acid and caustic Oo Carpenters, cabinet makers, and others who find it fre- IMPROVED ‘PRESSURE BLOCKS FOR PLANING MACHINES, er carbonate of soda from Chili saltpeter at one operation, We illustrate herewith a novel improvement in planing which was patented in Prussia in 1867, in'the hope that… … Springfield, Ill., to whom inquiries terwards in large iron pans under a for further particulars may be ad- stone vaulted cover, until no more dressed." gas was evolved, and the mass be © 1875 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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