. Scientific American Volume 06 Number 21 (May 1862) . h, composed of 202 partsmercury and 1,292 parts zinc, both by weight. Toevery tun weight of this alioy is added 1 lb. of potas-sium or of sodium, the latter being preferred. Assoon as the cleaned iron has attained the point offusion of this triple alloy, viz., 680°, it is removed,and is found to be thoroughly coated with zinc. Theaffinity of this alloy for iron is so intense that at thefusing heat of 680° it will dissolve a plate of wroughtiron one-eighth of an inch thick in a few the articles to bo covered are small, or thepa
. Scientific American Volume 06 Number 21 (May 1862) . h, composed of 202 partsmercury and 1,292 parts zinc, both by weight. Toevery tun weight of this alioy is added 1 lb. of potas-sium or of sodium, the latter being preferred. Assoon as the cleaned iron has attained the point offusion of this triple alloy, viz., 680°, it is removed,and is found to be thoroughly coated with zinc. Theaffinity of this alloy for iron is so intense that at thefusing heat of 680° it will dissolve a plate of wroughtiron one-eighth of an inch thick in a few the articles to bo covered are small, or theparts minute, as for example, wire, nails or smallchains, it is necessary before immersing them topermit the triple alloy to dissolve, or combine withsome wrought iron, in order that its great affinity forthe articles may be partially diminished. When a sheet of white paper is moistened with ben-zole it becomes temporarily transparent, and anylines may be traced through it. In a few hours thebenzole evaporates, and the paper becomes opaque, OP. THE SCIENTIFIC AMERICAN. • THE BEST MECHANICAL PAPER IN THE WORLD. EIGHTEENTH YEAR. VOLUME VI.—NEW SEBIES. A new volume of this widely circulated paper commenced on the 5thof January. Every number contains sixteen pages of useiu informa-tion, and from five to ten original engravings of new inventions anddiscoveries, all of which are prepared expressly for its columns. The SCIENTIFIC AMERICAN is devoted to the interests of PopularSeimict*, the Mechanic Arts, Manufactures, Inventions, AgricultureCommerce, and the Industrial pursuits generally, and is valuable andinstructive not only in the Workshop and Manufactory, but also inthe Household, the Library and the Reading Room. The SCIENTIFIC AMERICAN has the reputation, at home andabroad, of being the best weekly journal devoted to mechanical andindustrial pursuits now published, and the proprietors are determinedtu keep up the reputation they have earned diring the seventeen y
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