3. Yellow resin, beeswax, and plaster of Paris, equal parts.
4. Resin, 8 parts; wax, 1 part; melt and stir in plaster of Paris, 4 parts, or q. s.
5. Sulphur or shell-lac, melted with sufficient plaster of Paris or colouring matter to give the desired shade. Used to join or mend pieces in alabaster, white marble, Derbyshire spar, porphyry, and other like substances; and to fill up cracks, supply chips out of corners, &c. The last four are applied hot, the surfaces to be united having been previously warmed. See CEMENT, WATERGLASS.
=Cement, Architect'ural.= 1. From paper (reduced to a smooth paste by boiling it in water), sifted whiting, and good size, equal parts, boiled to a proper consistence.
2. Paper paste, size, and plaster of Paris, equal parts; as before.
_Obs._ This is a species of papier-mache. It is used to make architectural ornaments, busts, statues, columns, &c. It is very light, and receives a good polish, but will not stand the weather unless it is well varnished or painted.
=Cement, Arme'nian.= _Syn._ DIAMOND CEMENT, PERSIAN C., TURKISH C., JEWELLERS' C. The jewellers of Turkey, who are mostly Armenians, have a singular method of ornamenting watch-cases, &c., with diamonds and other precious stones, by simply gluing or cementing them on. The stone is set in silver or gold, and the lower part of the metal made flat, or to correspond with the part to which it is to be fixed; it is then gently warmed, and the glue is applied, which is so very strong that the parts thus cemented never separate. This glue will strongly unite pieces of glass and china, and even polished steel, and may be applied to a variety of useful purposes.
_Prep._ 1. (Original Armenian formula; Eton.) Dissolve five or six bits of gum mastic, each the size of a large pea, in as much rectified spirit of wine as will suffice to render it liquid; and, in another vessel, dissolve as much isinglass, previously a little softened in water (though none of the water must be used), in French brandy or good rum, as will make a two-ounce phial of very strong glue, adding two small bits of gum galbanum or ammoniacum, which must be rubbed or ground till they are dissolved.
Then mix the whole with a sufficient heat. Keep the glue in a phial closely stopped, and when it is to be used set the phial in boiling water.
2. (Keller's ARMENIAN CEMENT.) Soak isinglass, 1/2 oz., in water, 4 oz., for 24 hours; evaporate in a water bath to 2 oz.; add rectified spirit, 2 oz., and strain through linen; mix this, whilst warm, with a solution formed by dissolving gum mastic (best), 1/4 oz., in rectified spirit, 2 oz.; add of powdered gum ammoniac 1 dr., and triturate together until perfectly incorporated, avoiding loss of the spirit by evaporation as much as possible.
3. (Ure's DIAMOND CEMENT.) Isinglass, 1 oz.; distilled water, 6 oz.; boil to 3 oz., and add rectified spirit, 1-1/2 oz.; boil for a minute or two, strain, and add, while hot, first a milky emulsion of ammoniac, 1/2 oz., and then tincture of mastic, 5 dr.
4. Isinglass soaked in water and dissolved in spirit, 2 oz. (thick); dissolve in this 10 gr. of very pale gum ammoniac (in tears), by rubbing them together; then add 6 large tears of gum mastic, dissolved in the least possible quantity of rectified spirit.
5. Isinglass dissolved in proof spirit (as _above_), 3 oz.; bottoms of mastic varnish (thick, but clear), 1-1/2 oz.; mix well.
_Obs._ When carefully made, this cement resists moisture and dries colourless. As usually met with, it is not only of very bad quality, but sold at exorbitant prices. "Some persons have sold a composition under the name of Armenian cement in England; but this composition is badly made; it is much too thin, and the quantity of mastic is much too small." (Eton.) Methylated spirit may be used instead of the pure spirit in the above preparations. Mastic and mastic varnish are also used by jewellers as cements.
=Cement, Beale's.= Chalk, 60 parts; lime and salt, of each 20 parts; Barnsey sand, 10 parts; iron filings or dust, and blue or red clay, of each 5 parts; grind together and calcine. Patented as a fire-proof cement.
=Cement, Boil'er.= _Prep._ Dried clay in powder, 6 lbs.; iron filings, 1 lb. Make into a paste with boiled linseed oil. Used to stop cracks and leaks in iron boilers, stoves, &c. See CEMENT, IRON, STEAM-BOILER C.
=Cement, Bot'any Bay.= Yellow gum (Botany Bay gum) and brickdust, equal parts, melted together. Used to cement coarse earthenware, &c.
=Cement, Bot'tle.= _Prep._ 1. Resin, 1 lb.; tallow or suet, 1/4 lb.; melt together, and stir in the colouring matter.
2. Resin, 5 lbs.; beeswax, 1 lb.; colouring, q. s.; as last.
3. (Red.) To each pound of the above add whiting (dry), 3 oz., and light red (burnt ochre), 4 oz.; or red bole, q. s. (all in fine powder).
4. (Black.)--_a._ To each pound of No. 1, or No. 2, add ivory black (bone black), q. s.
_b._ From black pitch, 6 lbs.; ivory black and whiting of each, 1 lb.; melted together. Used in the same way as common sealing-wax for bottle corks, cask bungs, &c. See CEMENT, MAISSIAT'S.
=Cement, Brim'stone.= Melted brimstone, either alone, or mixed with resin and brickdust. Cheap and useful.
=Cement, Bru'yere's.= Clay, 3 parts; slaked lime, 1 part; mix and expose them to a full red heat for 3 hours, then grind to powder. Recommended as an hydraulic cement.
=Cement, Build'ing.= _Syn._ ARTIFICIAL PUZZOLENE'. From a mixture of clay or loam, broken pottery, flints, or siliceous sand, or broken bottle glass, and wood ashes, exposed to a considerable heat in a furnace, until it becomes partially vitrified; it is then ground to fine powder, sifted, and mixed with one third its weight of quick-lime, also in fine powder, after which it must be packed (tight) in casks to preserve it from the air and moisture. For use it is mixed up with water and applied like Roman cement.
=Cement, Cap.= _Prep._ 1. Resin, 5 lbs.; beeswax and dried Venetian red, of each 1 lb.; melted together.
2. (C. G. Williams.) Equal weights of red lead and white lead. Used for chemical and electrical purposes. For cementing glass tubes, necks of balloons, &c., into metal mountings. No. 2 is preferable to white lead alone, and may be depended on for temperature up to 212.
=Cement, Cheese.= From grated cheese, 2 parts; quick-lime (in fine powder) 1 part; white of egg, q. s.; beat to a paste. Used for earthenware, &c.
=Cement, Chem'ical.= _Syn._ SOFT CEMENT. _Prep._ From yellow wax, 4 parts; common turpentine, 2 parts; Venetian red (well dried), 1 part; melted together. Used as a temporary stopping or lute for the ends or joints of tubes, which are not exposed to much heat; as in alkalimetry, &c. See CEMENT, ELECTRICAL.
=Cement, Chi'nese.= _Syn._ SHELL-LAC CEMENT, LIQUID GLUE. _Prep._ 1.
Finest pale orange shell-lac (broken small), 4 oz.; rectified spirit (strongest), 3 oz.; digested together in a corked bottle in a warm place until dissolved. Very strong and useful; almost odourless. It should have about the consistence of treacle.
2. As before, but using rectified wood naphtha as the solvent. Inferior to the last, but excellent for many purposes.
3. (Without spirit.) _Prep._ Borax, 1 oz.; water, 3/4 pint; shell-lac, 3 oz.; boil in a covered vessel until dissolved, then evaporate to a proper consistence. Cheap and useful, but dries slowly.
4. Macerate for several hours, 6 parts of glue, in small pieces, in 16 parts of water; then add 1 part of hydrochloric acid, and 1-1/2 part of sulphate of zinc; and let the mixture be kept for 10 or 12 hours at a temperature of 68 or 70 C.
_Uses, &c._ Employed to mend glass, china, fancy work, jewelry, &c., for which it is only inferior to Armenian cement. The first formula produces a cement so strong that pieces of wood may be joined together, cut slopingly across the grain, and will afterwards resist every attempt to break them at the same place. In many of the islands of the Indian Ocean, in Japan, China, and the East Indies, a similar cement is used to join pieces of wood for bows, lances, &c. The fluid is thinly smeared over each face of the joint, a piece of very thin gauze interposed, and the whole pressed tightly together and maintained so until the next day. Joints so made will even bear the continual flexure of a bow without separating. It is admirably adapted for fishing rods. The product of the second formula is commonly sold as LIQUID GLUE. That of the last is much used by the druggists and oilmen, instead of gum, for fixing paper labels to tin, and to glass when exposed to damp.
=Cement, Cop'persmiths'.= _Syn._ BLOOD CEMENT. From bullock's blood thickened with finely powdered quick-lime. Used to secure the edges and rivets of copper boilers, to mend leaks from joints, &c. It must be used as soon as mixed, as it rapidly gets hard. It is cheap and durable, and is suited for many other purposes.
=Cement, Curd.= _Prep._ 1. The curd of skimmed milk (obtained by the addition of vinegar or rennet) is beaten to a paste with quick-lime, in fine powder.
2. Add vinegar, 1/2 pint, to skimmed milk, 1/2 pint; mix the curd with the whites of 5 eggs; well beaten and powdered quick-lime, q. s. to form a paste. Used for mending glass and earthenware; they resist water and a moderate degree of heat.
3. Rub from two to four parts of the curd, with a cold solution of borax, till a thick liquid is obtained, that becomes clear on standing. This is an excellent cement for artificial meerschaums, and may be used to give consistency to silk goods, or to coat artificial flowers, and court plaster, to the latter of which it imparts more adhesiveness and firmness.
=Cement, Cut'lers'.= _Prep._ 1. Black resin, 4 lbs.; beeswax, 1 lb.; melt, and add finely powdered and well-dried brickdust, 1 lb.; mix well.
2. Equal weights of resin and brickdust, melted together.
_Use._ To fix knives and forks in their handles. It is put into the hollow of the handle, and the metal, previously made hot enough to melt the composition, pressed into its place whilst warm, and the whole kept upright and still until quite cold.
=Cement, Di'amond.= See CEMENT, ARMENIAN.
=Cement, Egg.= White of egg thickened with finely powdered quick-lime.
Used to mend earthenware, glass, china, marble, alabaster, spar ornaments, &c. It does not resist long exposure to moisture unless it has been exposed to heat.
=Cement, Elas'tic.= _Prep._ 1. Caoutchouc (in small pieces), 1 part; chloroform, 3 parts; dissolve.
2. (Lenher.) Caoutchouc, 5 parts; chloroform, 3 parts; dissolve, and add gum mastic (powdered), 1 part. Elastic and transparent.
3. Gutta percha, 3 parts; caoutchouc, 1 part (both cut small); bisulphide of carbon, 8 parts; mix in a close vessel and dissolve by the heat of a water bath. This is to be gently warmed before it is applied.
4. Gutta percha, 1 lb.; caoutchouc, 4 oz.; pitch, 2 oz.; shell-lac, 1 oz.; linseed oil, 2 oz.; melted together. This must be melted before being applied.
_Obs._ The cements 1 and 2 are elastic and transparent, and are applicable to many uses. The others, 3 and 4, are used for uniting leather, cloth, &c.
=Cement, Elec'trical.= _Syn._ CHEMICAL CEMENT. From black resin, 7 lbs.; red ochre, 1 lb.; plaster of Paris, 1/2 lb. (both well dried and still warm); melted together, and the heat and agitation continued until all frothing ceases, and the liquid runs smooth; the vessel is then withdrawn from the fire, and the mixture stirred until cooled sufficiently. Used to cement the plates in galvanic troughs, join chemical vessels, &c. See CEMENT, CAP, CEMENT, SINGER'S, &c.
=Cement, Engineers".= _Prep._ 1. Ground white lead, mixed with as much red lead as will make it of the consistence of putty.