| IX.— | Iron filings | 160 ounces |
|---|---|---|
| Lime | 80 ounces | |
| Red lead | 16 ounces | |
| Alum | 8 ounces | |
| Sal ammoniac | 2 ounces | |
| X.— | Clay | 10 ounces |
| Iron filings | 4 ounces | |
| Salt | 1 ounce | |
| Borax | 1 ounce | |
| Black oxide of manganese | 2 ounces | |
| XI.—Mix: | ||
| Iron filings | 180 ounces | |
| Lime | 45 ounces | |
| Salt | 8 ounces | |
| XII.—Mix: | ||
| Iron filings | 140 ounces | |
| Hydraulic lime | 20 ounces | |
| Sand | 25 ounces | |
| Sal ammoniac | 3 ounces |
Either of these last two mixtures is made into a paste with strong vinegar just before use.
XIII.—Mix equal weights of zinc oxide and black oxide of manganese into a paste with water glass.
XIV.—Copal varnish, 15 parts; hydrated lime, 10 parts; glue de nerfs (of sinews), 5 parts; fat drying oil, 5 parts; {25} powdered turpentine, 3 parts; essence of turpentine, 2 parts. Dissolve the glue de nerfs on the water bath, add all the other substances, and triturate intimately.
XV.—Copal varnish, 15 parts; powdered turpentine, 3 parts; essence of turpentine, 2 parts; powdered fish glue, 3 parts; iron filings, 3 parts; ocher, 10 parts.
XVI.—To make a cement for cast iron, take 16 ounces cast-iron borings; 2 ounces sal ammoniac, and 1 ounce sulphur. Mix well and keep dry. When ready to use take 1 part of this powder to 20 parts of cast-iron borings and mix thoroughly into a stiff paste, adding a little water.
| XVII.— | Litharge | 2 parts |
|---|---|---|
| Boiled linseed oil | 2 parts | |
| White lead | 1 part | |
| Copal | 1 part |
Heat together until of a uniform consistence and apply warm.
XVIII.—A cement for iron which is said to be perfectly waterproof and fireproof is made by working up a mixture of equal weights of red lead and litharge with glycerine till the mass is perfectly homogeneous and has the consistency of a glazier’s putty. This cement is said to answer well, even for very large iron vessels, and to be unsurpassable for stopping up cracks in large iron pans of steam pipes.