The ingredients of a mixture for welding copper are;
2 parts Boric Acid,
1 part Soda Phosphate.
The following compound is useful for welding steel to iron or steel:
35 parts Iron Filings (free from rust). 70 parts Sal-ammoniac, 70 parts Prussiate of Potash, 500 parts Borax.
This compound is to be pulverized in a mortar and next turned into a crucible. Water is added until a thick paste is made and the crucible is put over a wood fire and the contents are continuously stirred. The resultant is then cooled, pulverized, and is ready for use. It looks a good deal like pumice-stone, with green and gray streaks.
A compound for welding wrought iron and steel, at a red heat, is composed of:
7 6-10 parts Colophony, 26 7-10 parts Prussiate of Potash. 35 parts Boric Acid,
30 1-10 parts Common Salt.
Another compound is composed of the following mixture:
6 parts Borax,
1 part Prussiate of Potash, 1/2 part Resin,
2 parts Sal-ammoniac, pulverized and mixed with water. The mixture is then boiled with constant stirring until the formation of a stiff paste. This paste is then hardened over a fire, and, when cold, pulverized and mixed with 1 part wrought iron filings, free from rust. In use the powder should be scattered upon the red-hot pieces and liquefied over the fire.
A compound for welding wrought iron to wrought iron at a red heat is composed of:
1/2 part Sal-ammoniac, 1/2 part Water, 1 part Borax.
These ingredients are boiled and stirred until stiff, then they are allowed to harden over a fire. After it is cooled the compound should be pulverized and thoroughly mixed with 1-3 part of unrusted wrought iron. Dovetail the pieces to be welded and make the place to be welded red-hot, then scatter the powder upon it and liquefy over a fire. A light tap or two with a hammer is ample for joining the pieces together.
White metal is composed of:
42 parts Tin, 40 parts Lead, 2 parts Cupro-manganese, 20 parts Antimony.
The whitening of brass and copper articles can be accomplished by boiling them in a solution of 1 pound grained tin, 3/4 pound cream of tartar and 2 quarts water. The dissolution of tin takes place in the cream of tartar, and it is again precipitated on the brass and copper.
For a wash which can be applied to lime walls and afterward become waterproof so as to bear washing. Take 3 parts silicious rock (quartz), 3 parts broken marble and sandstone, also 2 parts of burned porcelain clay, with 2 parts freshly slacked lime, still warm. In this way a wash is made which forms a silicate if often wetted, and becomes after a time almost like stone. The four constituents mixed together form the ground color to which any pigment that can be used with lime is added. It is applied quite thickly to the wall or other surface, let dry one day, and the next day frequently covered with water, which makes it water-proof. This wash can be cleansed with water without losing any of its color; on the contrary, each time it gets harder, so that it can even be brushed, while its porosity makes it look soft. The wash or calcimine can be used for ordinary purposes as well as for the finest painting. A so-called fresco surface can be prepared with it in the dry way.