The following cement is recommended for repairing damaged places in cast-iron tanks, cisterns, etc.: Five parts brimstone, 2 parts black lead, and 2 parts of cast-iron filings, previously sifted. Melt together, taking care that the brimstone does not catch fire. The damaged place, perfectly dry, is well heated by laying a piece of red-hot iron upon it, and is then stopped with the cement previously heated in a melting ladle until it becomes soft.
A cement for copper and brass parts of steam pipes is composed of:
10 parts Copper or Brass shavings (respectively),
1 part Sulphur.
1 part Gutta-percha.
2 parts Caoutchouc.
In order to repair a defect in a casting, heat the defective place, lay a piece of cement upon it, pressing same down with a hot iron. The following paste will be found valuable for this purpose: One part rosin, 1 part black pitch, melted in a crucible, and enough fine iron filings added for the formation of a stiff mass.
A cement for fastening hooks, clamps, iron rods, etc., in stone is made as follows: Make a paste of 1 part of iron filings, 3 parts of plaster of paris and glue water.
Another receipt gives 7 parts of plaster of paris to 1 of the iron filings. If it is desired that the article cemented is to stay white, iron filings should not be used and the cement should rather be made of 3 parts of white of egg, 7 parts of plaster of paris, with a large enough amount of water.
To make cement for fastening iron to stone, take fine iron filings, 10 parts; plaster of paris, 30 parts; sal-ammoniac, 1/2. Mix to a fluid paste with weak vinegar and use at once.
To fasten labels on polished nickel dissolve 400 parts by weight of coarsely powdered dextrine in 600 of water; add 20 parts glycerine and 10 of glucose and heat the mixture to 194 degrees Fahrenheit.
Mix into a thick solution of glue, finely ground chalk, until the mass gets the consistency desired.
The following compound will be found useful for fastening copper to sand-stone: Mix intimately so as to form a plastic mass 4 parts of powdered glass, 6 parts of bole, 6 parts of litharge, 4 parts of linseed-oil varnish and 7 parts of white lead. It will also fasten a number of other metals to a number of other species of stone.
A bismuth cement for cementing the glass parts on petroleum lamps is composed of:
2 parts Tin,
3 parts Lead,
2 5-10 parts Bismuth.
Concentrated sirupous glycerine mixed with finely ground litharge to a thick viscid paste makes a cement to resist heat, water, oil and acids. Glass, metal and wood may be cemented with it.
Cement for objects which have to be heated may be made as follows: Iron filings, 100 parts; clay, 50; common salt, 10; quartz sand, 20.