Oil cement for porcelain. Stir 20 parts of white lead and 12 of white pipe-clay into 10 of boiling linseed oil previously boiled and knead the mass thoroughly. After cementing let the articles stand quietly for several weeks.
Diamond cement. Litharge 30 parts, air-slaked lime 10, whiting 20, graphite 100, linseed oil 40. Apply hot. This is an excellent cement for metal.
Hager’s diamond cement. Whiting 16 parts, elutriated graphite 50, litharge 16.
Mix the pulverized ingredients with sufficient old, thick linseed oil to form a plastic dough.
RESINOUS CEMENTS.
Resinous cement for amber is obtained by melting mastic in linseed oil. Volatile copal lacquer can also be advantageously used for the purpose.
Cement for turners. Melt 1 lb. of rosin in a tin can over the fire, and when melted add 4 ozs. of pitch; while these are boiling add brick dust until, by dropping a little on a cold stone, you think it is hard enough. In winter it may be found necessary to add a little tallow.
By means of this cement a piece of wood may be fastened to the chuck, which will hold when cool, and when the work is finished, it may be removed by a smart blow with the tool. All traces of the cement may be removed from the work by repeated applications of benzine. To use this cement, chip off as much as will cover the chuck to the 1/16th of an inch, spread it over the surface in small pieces, mixing it with ⅛ of its bulk of gutta-percha, then heat an iron to a dull red heat, and hold it over the chuck till the mixture and gutta-percha are melted and liquid. Stir the cement until it is homogeneous, chuck the work, lay on a weight to enforce contact, leave it at rest 20 minutes.
The following cement is much employed and serviceable for the use of turners and artisans in general.
Reduce 1 lb. of whiting to a fine powder, and heat to redness so as to expel all the water. When cold this is mixed with 1 lb. of black rosin and 1 oz. of beeswax previously melted together, and the whole stirred till of uniform consistence.