Paget’s mastic. Sand 315 parts, whiting 105, white lead 25, calcined red lead 10, lead acetate solution 45, linseed oil 35.
The mastic may be colored by adding pigments.
Water-proof cement. A. Rubber 7 parts, oil of turpentine 140, linseed oil 40. B. Turpentine 100 parts, sulphuric acid 3, zinc-white 10.
To prepare solution A, place the rubber in the oil of turpentine in a bottle. It swells very much without actually dissolving. After adding the linseed oil, reduce the entire mass by boiling to one-half the volume originally occupied by it.
Solution B is prepared by stirring the sulphuric acid into the turpentine and allowing it to stand for twelve hours. To remove the sulphuric acid, the thick mass which has been formed is then kneaded in water in which the zinc oxide has been distributed. After drying, the resulting mass is dissolved in the warm fluid A.
Another formula is as follows: Linseed oil 8 parts, litharge 12, burnt lime 88.
Boil the linseed oil and litharge half an hour, then stir the lime into the hot mass, and use the mixture hot. This cement is excellent for filling in joints between stones, for flat roofs, water reservoirs, etc. For a better adhesion of the cement, apply a coat of linseed oil varnish to the surfaces to be cemented. Porous stones are made water-proof by heating the cement in a boiler and adding sufficient linseed oil to form a mass which can be readily worked with a smoothing board. Apply as hot as possible.
Serbat’s mastic. Pyrolusite 60 parts, sulphate of lead 60, linseed oil 10.
After thoroughly drying the materials, mix the sulphate of lead with the linseed oil, then add 20 parts of the pyrolusite and, after mixing and working it thoroughly, add gradually the rest of the pyrolusite in small portions and kneading constantly.
Stephenson’s oil cement. Litharge 20 parts, unslaked lime 10 parts, sand 10 parts, hot linseed oil 3 parts.