We are happy to learn, as we do from the following notice which appeared in the N. Y. Courier & Enquirer of the 12th ult., that the manufacturing of Plate Glass has bean commenced in this country with fair prospects of success. As soon as it can be had at reasonable prices, we have no doubt but that it will be used largely, in a rough state, in the construction of horticultural buildings. It is a matter of no little importance to all branches of architecture, and we shall watch its progress with interest.

"TRIUMPH OF PEACE, - It is pleasant in these days - when men read and talk so largely of armies and fleets, sieges and bombardments! sorties and repulses, trenches and parallels - it is pleasant, we say, to record a peaceful triumph of American skill and industry, which is destined to do much to promote the manufacturing interests of the country. One of the few appliances 01 taste and luxury for which we hare been entirely dependent upon foreign production has been Plate Glass. For this article we have paid tribute to the manufacturers of France, England, and Germany, to the amount of many millions of dollars, and every attempt to establish the manufacture in the United States has hitherto resulted in disappointment and loss, The more than French taste of our people for display in mirrors and huge window fronts, which has been so largely developed within the last few years, has offered a rich prise to the Company that should succeed in accomplishing the manufacture of an American article which would compete in quality and price with that imported.

"The American Plats Glass Company have achieved success, and on Thursday, in the presence of a large number of gentlemen who take an interest in every progressive step of American mechanical skill, several plates of glass three-eighths of an inch in thickness, and measuring sixty by one hundred and twenty inches on the surface, were cast. The establishment is situated at the foot of North Sixth street, Williamsburgh, and occupies a building of brick two hundred feet by one hundred feet square, the whole being covered by an iron roof Here are fabricated from the raw material the fire-brick, melting-pots, and furnaces. The capacious annealing ovens or kilos, the huge casting tables, and cranes, railways, moveable tables and carriages occupy the immense area. The process of manufacture may be briefly described, thus:

"The melting-pots, of a capacity to hold six hundred pounds of material, are made of fire-clay prepared in a peculiar manner and placed in the furnace, and when sufficiently hot are filled with the alkali and silex, and the doors closed upon them. In ten or twelve hours the mass is ready for casting. Near the furnace is an iron table a little more than five feet by ten, under which a alow fire is placed so that it is moderately heated. At the head of the table is an iron roller some two feet in diameter, and near that a swinging crane. The surface of the table is flush, but upon its edges are placed bars of iron corresponding in thickness to the thickness it is desired to cast the plate. These bars serve as bearers for the roller. The material being ready, the first step is to remove the furnace door, which is accomplished by means of long levers and tonga By aimi-lar means a pot is extracted from the furnace and placed on a carriage or truck. From the outside of the vessel all adhering substances from the coal is scraped off and the surface of the matter is also skimmed by ladles of all impurities.

A collar, with two long handles, is then lowered by the crane, and encloses the pot just under the projections or shoulders upon it, and by a windlass, it is raised some six feet and swung directly over the table. The projecting handles are then seised by two men, and in a moment the six hundred pounds of melted glass flows like a sea of lava over the iron surface. Two other men instantly send this ponderous roller on its way from the head of the table, reducing the mass to the thickness of which the iron bearers are the guage. In fifty seconds the mass is sufficiently solidified to permit it to be pushed rapidly upon a table having a wooden surface, resting upon rollers, which is at once pushed biasing and smoking to the mouth of a kiln, into which the glass is passed, there to remain from three to five . days, when it emerges, annealed and ready to be trimmed. The edges, even if the glass be an inch thick, are smoothly cut by a diamond, tad then it it ready for market in a state known at 'rough plate glass.' The whole process of casting is not only interesting but exciting. The men are drilled to move promptly and silently, handling their implements with great adroitness.

The process described does not occupy more than four to five minutes, and everything is immediately ready for another casting.

"The company do not as yet polish their glass to fit it for windows or mirrors, but are shout to introduce the machinery necessary for that purpose. At present there is sufficient demand for the rough plate, to be used in floors, roofs, decks, etc., to keep their Works constantly employed. They can produce plates two inches in thickness, and one hundred and twenty by two hundred and forty inches square, a new table weighing thirty-two tons being in readiness for eastings of the latter dimensions. It is believed that plate glass of great thickness, at a low price, will be introduced for many purposes for which iron and stone have hitherto been used.

"The duty on imported glass is thirty per cent; but so bulky and fragile is the article that the duty, expenses, and breakage, amount to near ninety per cent The fact that the company own a water front, and can ship directly from their works, is an important consideration in avoiding loss from breakage, affording at the same time advantages for receiving fuel, sand, and other material, direct.

"The construction of the works commenced on the 1st of February, and the first casting was made about the 1st of May, giving proof of a well digested plan and vigorous execution. The works are at present capable of producing seven hundred feet of three-eighths inch glass per day. The furnace holds twelve pots, and there are twelve annealing kilns, each forty by eighteen feet The fires, kept up by Cumberland coal, are not allowed to go down until the furnaces are destroyed, which generally occurs after a year's use. The pots after a casting are at once returned to the furnace and re-filled; they usually last a month. The temperature of the establishment is decidedly high, above the top of ordinary thermometers. The furnace fires are watched, as in a solar eclipse, through dark colored glass, the intensity of the light being unendurable to the naked eye. The appearance of the 'sea of glass' when poured over the table if extremely beautiful. At first of bright whiteness dazzling to the eye, it rapidly changes to pick, scarlet, crimson, and a dark murky red, streaked with black, in which state it is thrust into the kiln.

" It would be unjust in alluding to previous attempts to manufacture plate glass, not to mention the Cheshire Company, whose success was comparative, but whose failure was positive, Under grave difficulties they did produce some plate glass, but ultimately abandoned the scheme, submitting to a loss of nearly two hundred thousand dollars.*9