is exhibited in the engraving below. The saws are circular, and are put in motion by the straps at a. But one end of the rail is cut at the same time-that done, the rail is drawn under the saw at the other end, and cut off in like manner. Equal lengths are not generally demanded by Railroad companies, hence they are sometimes a little longer and sometimes shorter than the uniform length sought. After the ends are thus cut off, the rail is subjected to a few simple processes to render it perfectly straight, after which the whole work is completed.

SAWING APPARATUS FOR CUTTING RAILROAD IRON.

The whole number of charcoal furnaces supposed to be in operation in Pennsylvania, is about two hundred and eighty, yielding an annual product of two hundred and fifty thousand tons. The number of anthracite furnaces we estimate at fifty, yielding one hundred thousand tons, making the total of furnaces in the State three hundred and thirty, and the aggregate yield three hundred and fifty thousand tons. Under the tariff act of 1842, the number of furnaces, especially anthracite, increased at a most extraordinary rate-having almost doubled the entire number during the few years it remained in force. The present law, however, has all along operated unfavorably, and while many works have been suspended very few new ones have been put up. There is at this time, however, probably not less than fifteen millions of dollars invested in the production of iron, exclusive of about $6,000,000 invested in rolling-mills, and similar works for the conversion of the metal into forms for use, making the aggregate sum about $21,000,000. This, we think, is a moderate estimate, based on practical data. The number of persons employed in mining the anthracite and iron ore, is about five thousand; in making the charcoal, fifteen thousand; total, twenty thousand. The number of per

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sons directly dependent on this description of labor may be stated at seventy thousand; of those supported by their labor in the conversion of pig iron, ninety thousand; and of the population connected with the production of iron, one hundred thousand-making the total number of persons directly and indirectly concerned in iron manufactures, in Pennsylvania, including miners and colliers, two hundred and eighty thousand. Besides this a large number are employed in the manufactories of machinery; in the transportation, sale, shipment, and other branches of the trade.

We have thus endeavored to present the outline features of several of the more prominent points of inquiry upon iron manufactures. To describe particularly the whole process would require a volume thrice the extent of these pages. To those desiring more elaborate information, and scientific and practical data, we would commend the able work of Mr. Overman, already alluded to, which combines all on this subject that the most practical and curious could desire. Nearly all the foregoing illustrations are copied, by permission of the publisher, from this work: H. C. Baird, Philadelphia.

A short distance from Tyrone station is the celebrated SINKING SPRING, situated in a limestone formation, in the valley bearing the same name. It is an object of great interest, and well deserves a visit from the passing traveller. The spring, where the water emerges, is called Arch Spring, because it rises in a large limestone rock, with a high arch overhanging. As the stream runs along amidst the wildest scenery, it receives additions from smaller springs, when finally the whole volume of water disappears in a large cavern, and again enters the bowels of the earth. In the inside of this rocky cavern the stream continues from eighteen to twenty feet wide. The roof declines as you advance, and a ledge of loose rugged rock keeps in tolerable order upon one side, affording means to scramble along. In the midst of this cave are large quantities of brush, fragments of trees and branches, and such like matter, lodged quite up to the roof, thus indicating that the water, during freshets, is swelled up to the full capacity of its rocky jaws. This opening continues several hundred yards, when the cavern opens into a spacious room, at the bottom of which is a great vortex, into which the water is precipitated, and whirls round with amazing force. The stream is supposed to pass several miles under Brush and Cove Mountains, and to re-appear by two branches, which empty into the Frankstown branch of the Juniata.

Opposite the station at Tyrone, on the left, we have Tussey's Mountain, and on the right the bold ridge constituting the Bald Eagle Mountain, celebrated for its deposits of iron ore. The whole country here, however, is filled with iron ore and limestone, with some thin layers of the carbonate of lead, which, many years ago, excited a great deal of attention. A few hundred yards above this station is TYRONE CITY, a sprightly little village, sailing with flying colors under à prosperous breeze. All it wants to become a city in reality, is fair play and plenty of time. It already has the name, and makes a decent exhibit of several brick houses, among which is a hotel, which looks large enough to accommodate a crowd of hungry summer tourists. We say hungry, because we happen to know something about it. Turn a city "pale-face" loose among these mountains, let him ramble boldly amongst the foxes, and snakes, and bears that frequent them, and if he never before knew Appetite, he will soon become familiar with him.

Passing the unimportant stations of TIPTON'S RUN, FASTORIA, BELL'S MILLS, and BLAIR FURNACE, we arrive at the intersection of the branch and main line of the railway at ALTOONA. The branch road extends six miles to Hollidaysburg, where it meets the Alleghany Portage road, already mentioned as crossing the mountain by means of inclined-planes and stationary steam-engines. The main branch of the Central Railroad, between Altoona on the eastern, and a point a few miles from Conemaugh station on the western slope of the mountain, is still in an unfinished state, but will probably be ready for use in the course of the next ensuing eight months. This road boldly climbs the mountain without the assistance of inclined-planes. The ascent is accomplished in twelve and a half miles, by a maximum gradiate of eighty-four and a half feet on straight lines, reduced on curvatures, according to their diameter, to seventy-five feet upon those of minimum radii. To reduce the elevation to be overcome, from the foot to the summit of the mountain, a tunnel has been driven through it at the highest elevation of the road, which is over eleven hundred yards in length. The elevation of this tunnel above tide-water is nearly twenty-two hundred feet! The whole distance across the mountain from Altoona to CONEMAUGH station is about thirty-five miles, or about the same distance as the present Portage Railroad with its ten inclined planes!

A brief description of this road, or some of its most prominent