. First century of national existence; the United States as they were and Great Britain. Sheets thus coatedare known as galvanized iron, though theiron is now coated with zinc by other meansas well as by the galvanic current. Onemethod, that of Mallet, is to place thesheets, after they are well cleaned by acidand scrubbed with emery and sand, in a satu-rated solution of liydrochlorate of zinc andsulphate of ammonia; and after this in abath composed of 202 parts of niercurv and1,292 of zinc, to every ton weight of whicha pound of potassium or sodium is compound fuses at 680° Fa
. First century of national existence; the United States as they were and Great Britain. Sheets thus coatedare known as galvanized iron, though theiron is now coated with zinc by other meansas well as by the galvanic current. Onemethod, that of Mallet, is to place thesheets, after they are well cleaned by acidand scrubbed with emery and sand, in a satu-rated solution of liydrochlorate of zinc andsulphate of ammonia; and after this in abath composed of 202 parts of niercurv and1,292 of zinc, to every ton weight of whicha pound of potassium or sodium is compound fuses at 680° Fahrenheit,and the zinc is immediately deposited uponthe iron surface. Another method is to stirthe sheets in a bath of melted zinc, the sur-face of which is covered with sal use of heavy sheets or plates for build-ing purposes is also a recent application ofiron, that adds considerably to the demandfor the metal. The plates are stiffened bythe fluting, or corrugating, which they re-ceive in a powerful machine, and may beprotected by a coating of zinc. Their prep-.
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Keywords: ., bookauthorhodgejam, bookcentury1800, bookdecade1870, bookyear1874
