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To Apply Paper to Walls

2817. Fuchs' Soluble Potash Glass.

The upper end of the piece should then be A mixture of 15 parts pulverized quartz, or taken by the corners, and the operator, step- pure quartz sand, 10 parts of well purified , should potash, and 1 part powdered charcoal, may be barely stick the piece at the top, and in such conveniently employed. These ingredients a manner that the edge shall coincide with are to be well mixed and exposed to a strong the piece previously hung; this can be done heat in a fire-proof melting-pot for 5 or 6 by sighting down the trimmed edge of the hours, until the whole fuses uniformly and piece, while it is held in the hands. The steadily; as much heat is required as is necloth should now be held in a loose bunch, cessary to melt common glass. The melted and the paper smoothed with it from top to mass is then taken out by means of an iron bottom, care being taken to work out all air spoon, and the melting-pot immediately refrom under the paper, which, if not thoroughfilled with a fresh quantity. (At this stage ly done, will give it a very unsightly blistered of the process it is said by another authority, appearance. If any air remains under a part that, by pulverizing and exposing it to the air, of the strip after it has been hung, a hole it will absorb acidity, and by degrees the formust be pricked through the paper with a pin, to allow of its escape. A soft flat whiskbrush (such as is used for brushing clothes) is better for smoothing the paper than a cloth.

After the top is secured so that the pattern eign salts will, after frequent agitation and stirring, be completely separated, particularly after pouring over the mass some cold water, which dissolves them, but not the soluble glass.) It is then broken up, pulverized, and matches, brush once down the centre of the dissolved in about 5 parts of boiling water, strip as far as the paste is exposed. Then carefully unfold the bottom of the strip, brush down the centre, and smooth the whole by brushing from the centre to the edges, right and left, all the way down, finishing with one sweep down the trimmed edge, to ensure a perfect join. A moist cloth should be always at hand to keep the figures clean and free by introducing it in small portions into an iron vessel and constantly stirring the liquid, replacing the water as it evaporates, by adding hot water from time to time, and continuing to boil for 3 or 4 hours, until the whole is dissolved-a slimy deposit excepted and until a pellicle begins to form on the surface of the liquid, which indicates that the solution is in as is often the case in old houses, it will be however, when the liquid is stirred; and the difficult to avoid wrinkles, but they can be boiling may then be continued for a short mostly got rid of by cutting the paper and time, in order to obtain the solution in the allowing the cut edges to lap over each other, proper state of concentration, when it has a in places where there would otherwise be a specific gravity of from 1.24 to 1.25 (about wrinkle. By following these directions the 28° Baumé). In this state it is sufficiently most inexperienced will be able to do a liquid to be used in many operations; in some instances it will be necessary to dilute it with a high degree of skill is only secured by more or less water. When evaporated to a practice. from color. If the wall be uneven or crooked, a state of great concentration; it disappears,

2815. Το Make Glue Sizing. Break advantage in but few cases. Very frequently syrupy consistence, it can be employed with up the glue into small pieces, put it in a it is found contaminated with a little sulphide vessel with sufficient cold water to just cover of potassium, and it becomes necessary to add it; let it soak over night, and in the morning a little oxide of copper or copper scales tothe glue will be soft enough to melt readily wards the end of the boiling, which liberates with a moderate heat, or in a waterbath. a small quantity of potash, but which renders Add water to reduce to the desired con- it rather more suitable for many practical pursistency. This must be applied as directed poses than otherwise. If it is desirable, howin the foregoing receipts. ever, to have a water-glass which is entirely 1 TO DYE WOOD. neutral, it requires to be boiled with freshly- 2823. Soluble Glass for Stereo-Chroprecipitated silica as long as any silica is dissolved. mic Painting. Soluble glass for the use of stereo-chromic painting is obtained by fusing 3 parts of pure carbonate of soda and 2 parts