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Parker's Cement

This valuable cement is made of the nodules of indurated and slightly ferruginous marl, called by mineralogists septaria, and also of some other species fire then becomes, the more does the cement of argillaceous limestone. These are burnedin melt and combine with its metallic ingredi. ents, and the more completely will the crack become closed. 2215. Cement for Fastening Iron to Stone. A cement for fastening iron to stone, which becomes nearly as hard as the stone conical kilns, with pit coal, in a similar way to other limestone, care being taken to avoid the use of too much heat, as, if the pieces undergo the slightest degree of fusion, even on the surface, they will be unfit to form the cement. After being properly roasted, the itself, consists of 6 parts Portland cement, 1 calx is reduced to a very fine powder by part powdered lime, not slacked, 2 parts sand, and 1 part slacked lime, mixed with water to the proper consistency, the stone and iron both being previously dampened. In 48 hours it will have set firmly. 2216.

Strong Cement for Iron. To 4 or 5 parts clay, thoroughly dried and pulverized, add 2 parts iron filings free from oxide, 1 part peroxide of manganese, part of sea salt, and 1/2 part borax. Mingle thoroughly, and render as fine as possible; then reduce to stone. The cement is insoluble, and is not attacked by strong acids.