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cement, glue, water, time, materials, wood, proportion, stirring and purposes

GLOBE, (French) a spherical body, more usually called a sphere. See SPHERE.

GLUE, (from the French) a tenacious viscid matter, made of the skins animals, fiu• cementing two bodies together.

Glue is bought in cakes; and is better, as the skin of the animal froln which it is Made is older: that which swells much when steeped in water, without dissolving in it, is of the best quality.

To prepare glue; break the cakes into small fragments of convenient size : soak them in as much water as will just cover them; after it has remained about twelve hours, boil the whole in a copper or leaden vessel, over a gentle fire, till the glue is dissolved in the water, stirring it constantly with a wooden stick : it should then be poured through a sieve, to separate it from the scum and other filth: and lastly, it should be boiled over a smart fire, and put into a wooden vessel, in which it is to remain for use.

Tv make good glue for external work : grind as much white lead with linseed oil as will just make the liquid of a whitish colour, and strong but not thick; and it will then be fit for use.

The following is given by Nr. Glenne! as a good method of gine, The materials above enumerated are first digested in lime-water, to cleanse them from grease or dirt; they are then steeped in clean water with frequent stirring, and afterwards laid in a heap, and the water pressed out. They are then boiled in it large brass cauldron with clean water, scumming off the dirt as it rises, and it is flirther cleansed, by putting in, after the whole is dissolved, a little melted alum, or lime, finely powdered. The scumming is continued for some time. after which the mass is strained through baskets, and suffered to settle, that the remaining impurities may subside. It is then poured gradually into the kettle again, and farther evaporated by boiling and scum ming. till it becomes of a clear dark-brownish colour. When it is Ur ;light to be strong enough. it is poured into frames or moulds about six feet long. one broad, and two deep, where it gradually hardens as it eools, and is cut out when cold by a spade into square cakes. Each of these is placed in a sort of wooden box, open in three divisions to the back ; in this, the glue, while yet soft, is cut into three slices, by an instru ment like a bow, with a brass wire for its string. The slices are then taken out into the open air, and dried on a kind of coarse net-work. fastened in moveable sheds, four feet square, which are placed in rows in the glue-maker's field. When perfectly dry and hard, it is fit for sale." Mr. Austin, of Ilatton Garden, some time since, took out a patent for "a new method or cementing certain mute rials building and other purposes." The mode of inanufac ture and applying it, is thus described in the specification : `• The cement used by the patentee is made by mixing India-rubber with cold naphtha. in the proportion of eight ounces of India-rubber cut into small pieces. each gallon of

naphtha, stirring it from time to time, until the India rubber is dissolved ; then, to one part. by ‘veiolit, of this mixture two parts of lac are added, and the whole is tho roughly blended together by the application of heat, a•com panied with occasional stirring. \Viten greater elasticity is required, a larger proportion of the India-rnhber solution is used ; if greater hardness is necessary, a larger proportion of lac is employed ; and where the lndia-rubber would be liable to injury from great exposure and pressure, a much less proportion is used, and it is sometimes dispensed with altogether; asphalte, pitch, or resin, or other materials of that nature, may in some instances he substituted the lae.

The materials; for huilding-purposes to which this cement is appli,ed are, slate, tiles, stone, glass, and metal-plates. When being used, the cement is kept in a heated state in a dish or vessel containing, a narrow trough, termed a stamper, which slides up and down therein between guides; the slate or other material is brought to the heat of 150 degrees Fahrenheit, and placed upon the dish, and the stamper being then raised. imprints or stamps a margin of cement thereon. The requisite margins of cement for forming overlapping joints being thus applied to the slate or other material, the cemented portions or margins are laid in contact with each other, and in a short time become firmly united, (brining water-tight surfitees. Sometimes, to expedite the process, a coating of naphtha. or other spirit that will act upon the cement, or a solution made by dissolving the cement in naphtha or other spirit, is applied to the cemented portions, or margins. The cement may also he used for securing, the above materials to the building, as well as to each other." The patentee eonnects pieces of glass together with the above cement when making skylights, conservatories, frames for horticultural purposes, &c. ; he also cements slate, stone, metal, and inamithetured clays and cements, together, or to wood, or to woven and other fabrics, to wood finr building or other purposes; he likewise ceinents pieces of leather for making boots and shoes, and hose or pipes fbr fire-engines ; also leather and cork together, or to wood, metal, or woven or other fabries, and woven and other fabrics to wood, fir the manufacture of trunks, portmanteaus, packing eases, and other purposes. AVIlen joining these materials, the parts must be dry and free from dust, and should be warmed pre vious to receiving a coat of the cement, in order that it may not be chilled at the moment of application. If the joint is to be made at once, the parts must be expeditiously put together and pressed, as the cement rapidly loses its heat, and becomes solidified, but the junction may be effected at any subsequent period by the application of heat, or the spirit or solution before described."