Compactness in an engine is a very desirable quality, whether for facility in removal from one locality to another, diminution of weight and consequent friction or absorption of room. Short pipe connections are also to be considered advantageous. The engine shown in the accompanying illustration is one that better fulfills these requirements than any other of its power with which we are acquainted. Saving seen it in operation in a wood sawing and spKttti establishment where its capacity and performance were severely taxed, we feel free to say that it is a machine we can honestly commend as very superior. When running at 170 revolutions per minute it made no perceptible jar and worked almost noiselessly. Although occupying but a small space for its power, the parts are so arranged that the engineer experiences no annoyance in reaching every part. As seen, it is an upright engine, the cylinder and steam chest near the top of the frame, the piston rod connecting with a crosshead, that itself is connected to a walking beam at the bottom of the frame, the other end of the beam connecting with the crank and driving the pump which is inside the frame. The parts are balanced so that the resistance is equal on each end of the beam, and there is no shaking or jar under any circumstances. A double eccentric with link motion can be easily attached to act as a cut-off or for reversing the motion, adapting the machine to hoisting and other purposes. The piston rod, valve, valve stem, and all the connection pins, are of steel; the pump has Greene's Union Check Valve, which we shall presently describe; the heater is in close contiguity with the engine ; and the base plate has a rim for receiving all the drippings and the condensation from the steam, thus keeping the engine room neat and clean. The engine can be built per horse horse power much cheaper than engines of ordinary patterns, and can be transported entire or easily taken to pieces and packed on mules or horses, and as easily put together, making it especially adapted to the mining regions of the country. UNION CHECK VALVE. The union check valve herewith represented in perspective and section is used on this engine. It is a check valve, stop cock, and air cock, or tester, combined. A is the stop cock valve operated in the usual way by the hand wheel; the ordinary check valve is seen by its side. The air cock has one opening, B, through its center transversely, connecting with openings to the top and bottom of each valve and with the openings, C and D. Thus freezing and bursting may be prevented, and the condition and action of pump and valves may be, at all times, determined. THE UNION LUBRICATOR The lubricator seen in the two last engravings perspective and sectional is of the simplest imaginable form. It is in tended for the valves and pistons of engines. The plug is hollow with an opening at the bottom of the cup, or receiver and three vent holes, one shown, marked B, at the bottom of the tube, A. When the cup is filled the plug is in the posi tion shown in the sectional engraving and its interior is fill ed at the same time with the reservoir. In turning the plug to empty, the vent holes, B, will pass the orifice of the vent, C which is a, branch of the main delivery before the large bole in the plug, directly under the cup or reservoir, meets the main delivery, thus allowing steam from the engine to pass into the plug and assist in the discharge of the oil When the plug is turned back to refill, the vents, B, pass the orifice of the tube, A, through which the steam goes without disturbing the oil in the cup. The three vent holes are for allowing the plug to be turned in either direction, the center one being on a line with the main hole, and always when filling or discharging, aiding the operation by means of the Bteam. The parts may be easily removed for cleaning. Orders for this engine and appurtenances should be addressed to Greene, Trowbridge, orning, 326 and 328 Delancey street, New York City i m mm Annals of lowa-The Great Pipcstone Quarry. The first number of the " Annals of Iowa,1*' published quarterly by the State Historical Society at Iowa City, has made its appearance. It is edited by Sanford W. Huff, Corresponding Secretary of the Society, and contains much instructive and entertaining matter. Like the earlier annals of any section of the United States, it also contains many amusing incidents. As a taste of the flavor of Otis publication we have condensed from its pages an account of the great pipcstone quarry, around which so many legends cluster, and which has been celebratod by Longfellow in. the " Spng of Hiawatha:" On the mountains of the prairie, On the great Red Pipestone Quarry, Gitche Manito, the mighty, He the Master of Life descending On the red crags of the quarry Stood erect, and called the nations, Called the tribes of men together From the red stone of the quarry With his hand he broke a fragment, Molded it into a pipe head Shaped and fashioned it with figures. A narrow ledge of rocks in the broad shallow valley of a little prairie creek, lying entirely below the general prairie level, constitutes all there is of the Great Pipcstone Quarry. As far as the eye can reach in every direction, no " mountain of the prairie," no grove, no tree, no habitation, no living thing except a few birds, is in sight. The spot is within the State of Minnesota, about thirty miles in a direct line from its south-western corner, and three or four miles from its western boundary. Approaching it, the exposure of rocks appears much greater than it does in the distance when it looks like a mere line of broken rocks in the open prairie, for our view then takes in the whole region for many miles around it. The principal exposure of rocks is about a mile in length from north to south, in both of which directions it becomes gradually lost from view beneath the surface of the prairie, it faces the west and reaches its greatest perpendicular hight about twenty feet, where " Gitche Manito the mighty," is supposed to have stood when he took his wonderful smoke, and where the brook falls over it into the plain below. The pipe-stone is in somewhat thin and usually shaly layers, and only from eight to twelve inches in aggregate thickness, and is the lowest layer found here. The red quartzite rests immediately upon it, and is four or five feet thick at the ditch, and must be removed to get the pipestone. This pipestone is chemically a clay silicate of alumina colored brick-red with peroxide of iron. It is too heavy for pipes for white men, and is valued by them almost entirely for its legendary interest. It is heavier, harder, and in every re3pect inferior to meerschaum silicate of magnesia yet the finer specimens may be worked without much difficulty with a common saw, file, or knife, and readily takes and retains a considerable polish. Geologically it is a metamorphic clay, as the quartzite is metamorphic sandstone. It was originally a layer of clay interculated between layers of sandstone and the same metamorphic action that changed the latter to a quartz ite, also converted the clay into pipestone. ---------* . .--------- An old Spanish silver coin of the year 1017 has been found by a gentleman in Bangor, Me. It shows how rude the art of coinage was at that date, being " hammered out." Dressing Stone by Machinery. In the machine represented a vertical cutter-head is arranged to slide horizontally along on the side of a platform, on which the stone to be worked is clamped, and to oscillate j on its vertical axis to actuate the chisels secured in it. The I cutter-head may be adjusted to cut from right to left and vice j versa, and the platform on which the block of stone is secured j can be fixed an any angle required, so as to cut the stone at j any slant required. It is in use in England, and one of the machines is now being operated by Eobert Gray, at Erie, Pa., ! with great success. Letters Patent have been secured for this ! country through the Scientific American Patent Agency, dated | January 19, 1869. We copy the following engraving and description from the London Engineering : " We illustrate, above, an ingenious yet simple arrangement of stone-dressing machine, designed and patented by Mr. Joseph Ellicot Holmes, of Chester, which appears likely to take a very high position amongst machinery of its class. In designing this machine it has been Mr. Holmes' endeavor to imitate as closely as possible the effect produced by the mallet and chisel in the hands of skilled masons, and the work turned out by the machines already constructed on this plan shows that this end has been well attained. We shall first describe the machine in detail, and then give some account of its performance. Our illustrations comprise a front elevation, two end elevations, and a plan of the machine ; and referring to these views, A A is the main framing which comprises the bed-plate, A', on which the block of stone to be cut is fixed. B B are traveling arms, in which the cutter stock or cross-head (fitted with chisels, picka, and tools) is mounted, and which arms and cutters are made to traverse the main frame, A A, from end to end alternately, or, from left to right, and vice versa, hy the screws, c c. d d are eccentric bearings, or plum-mer-blocks, in which the ends or journals of the cutter-stock or cross-head are centered. These bearings may be turned by a lever or levers, not shown in the engravings, and may be fixed in position by stop-bolts; e is the cutter-stock or cross-head, in which the picks, chisels, and tools are fixed. The picks or chisels are shown at e e. " A lever, F, is fixed to the stock or cross-head for giving right and left hand cutting motions to the chisels or tools, as the case may be, this lever being coupled by the connecting rod, I, to the crank of a cranked shaft; Gr, centered in the heads f the traveling arms, B B, and turned by the miter wheel, H. By taking out the pin, g, the connecting rod, I, can be readily uncoupled, and the lever, F, turned so that it inclines in the opposite direction, for the purpose which we shall explain presently. " J is the main shaft haying a driving pulley, K, keyed on it at one end, and a slotted crank, L, also keyed at the other end. M is a second miter wheel mounted upon a short hollow shaft, m, which turns in a bearing provided on the head of one of the traveling arms, B. The main shaft, J, has a long groove cut in it to receive a tongue or feather in the hollow of th,e shaft, m, which is thus turned by, and traverses on, the main shaft from end to end, as the arms, B B, are moved backwards and forwards by the screws, C C. The heads of the arms, B B, are connected by the tie, or parallel bar, h. Bevel wheels, N, are keyed on to the ends of the screws, C C, and are connected by a shaft carrying other bevel wheels, as shown. O is a ratchet wheel, fixed on the upper screw shaft at the opposite end to the bevel wheel, N ; whilst P, a level centered upon the ratchet wheel, O, and fitted with a double or reversiing pawl, adjustable for turning the screws, C C, from left to right, or vice versa, according to the direction to which it is desired to work the cutter. " A connecting rod or link, Q, gives a rocking motion to the lever, P, by the revolutions of the slotted crank, L, on the end of the main shaft. The crank pin of this crank works in a hollow screw clamp; a,ud by varying the position of the crank pin, the lever, P, can be made to turn the screws, C, C, more or less at each revolution of the main shaft, J, and thus regulate the feed. R, S, and T are the clamps, screws, and cross bars by which the stone is secured in position while being dressed. " When operating this machine the stone (unshapen) is placed upon the table or bed-plate, A', with the side to be dressed towards the cutters, and it is then fixed in position by the clamps, R, S, and the clamping screws, T and T', aided when necessary by shuts and wedges abutting against the end frames. The cutters having been previously moved to the end, X or Y, as the case may be, and the cutter head or stock with the pointed or narrow chisels, e, sot to the required angle by attaching the lever, F, to the connecting rod, I, the cutters, e, being also adjusted for a greater or less depth of cut by j turning the eccentric, O, the power is applied through the pulley, 7c, to the shaft, J, and the required motion will be given to the whole of the moving parts of the machine. Now, if [ the surface of the block is tolerably quarry-faced, one cut of j the narrow chisels, e, as the cutter arms traverse the frame from y to x, will suffice to reduce the surface operated upon to a true and even plane, or nearly so, when by taking out the draw pin, g, and reversing the position of the cutter stock, thus bringing the broad chissls or tools to their working po-1 sition, and causing the cutter arms to traverse the frame the reverse way, or from X towards Y, the surface of the stone will be regularly and evenly tooled and finished. Thus by turning the block, the beds, faces, and joints may be shaped with truth and rapidity. "In the machine which is shown in the engraving, the bedplate, A1, and the cutter stock, E, are at right angles to each other, and it will, therefore, produce perfectly rectangular surfaces. It will be obvious, however, that by inclining the bed-plate or table more or less, any required angle may be given to the surfaces. Hence, when the machine is once set the work produced by it upon any number of blocks will be perfectly uniform, causing their beds and faces, or the angle of tiheir but ".ices to each other to be perfectlv true one witl* another. Thus, the use of square bevels and templates, etc., may be dispensed with, and the time required for setting out and working marginal drafts, as when dressed by hand labor, saved altogether. " Tha machine can be fitted with changing stocks for working concave or convex surfaces, and, by giving a rising and falling motion to the bedplate, spiral as well as plain and curved surfaces can be wrought by it. In cases where, from the inequalities of the quarry face, or the nature of the finished work required, it is necessary to give a second or third cut with the chisels before the broad tools are brought to their work, the cutter stocks can be reversed in the bearings, D; so that the chisels will then give a back as well as a forward cut, or, when the stocks are not reversible, the lever, F, can be lowered to clear the chisels, and the arms be run back to their normal position, and thus give a second or third cut from one and the same end of the frame. " The dimensions of the machines will vary according to the nature of the work for which they are intended. For ordinary purposes Mr. Holmes proposes to make the cutter stock give a cut three feet wide, with a traverse motion of eight feet, or, so as to dress the surfaces of a block of any size up to seven feet in length by three feet in width. For convenience of locomotion, the main frame may be provided with wheels, and, when necessary, a swing or traveling crane may be added to facilitate the operations of moving and turning the blocks of stone to and from, and also upon, the bedplate or table. It will be seen from what we have said that the oscillating movement imparted to the lever, F, will give to the cutters a recip rocating rotary motion of an extent sufficient to enable them at each stroke to remove chips from the stone in a very similar manner to that in which an ordinary mason's chisel acts. To ensure a correct action, the chisels are set at a certain angle in the cutter stock, which Mr. Holmes has found to be the best for the purpose. The tools used are, as we have said, of two kinds, namely, the narrow chisels or picks by which the surface of the stone is first acted upon, and the broader tools employed for the finishing cut. " Three machines of the kind we have described have been finished and set to work ; and it has been found that such machines are capable of dressing the hardest sandstones or millstone grits with an average forward cut of eighteen inches per minute. With stones fairly quarried or scabbled, not more than two cuts are required for the beds and joints, a third cut being taken for finished face work. With stones three feet deep, a rate of advance of eighteen inches per minute gives four and a half square feet dressed per minute, apart from the time occupied in turning and fixing the stones. With stones of fair size, and skilled and efficient handling, Mr. Holmes states that from two hundred to three hundred superficial feet can be wrought per day by one of these machines. " The work turned out is of excellent quality, and a leading feature in the machine is that it is capable of tougueing and grooving tfye entire surface of the beds and joints of tle stones without additional cost. This is a matter of great im- ] portance under many circumstances, as, for instance, in the case of high retaining walls. The grooving also assists the adhesion of the mortar, and prevents the passage of water. " The machines, we should state, are being made by Mr. Bryan Johnson, of Chester, and Messrs. Ormerod, Grierson, & Co., of the St. George's Iron Works, Manchester, these firms constructing them either in small sizes for working window caps, and sills, etc., in which case they may be worked by hand, or in large sizes for shaping the massive blocks sucli as are used in ths construction of docks, and other heavy works." For rights or machines for United States, address Robert Gray, Erie, Pa. Fifty Pounds of Nitro-glycerin Exploded in an Oil Well On the Mason farm a well has been sunk to the depth of over 800 feet, which has hitherto yielded bat little oil, with an abundance of gas. The proprietor, Jonathan Watson, determined to try the effect of a heavy charge of nitro-glycerin, and fifty pounds were exploded by Mr. Mowbray and his as-. sistants. Two cartridges were prepared, the one twenty-five Inches; in length, the othsr thirty-five inches, and each five inches in diameter. These were connected by a single copper wiro, thirty feet in length, so as to adjust the two charges immediately opposite two several mud veins which were known to be that distance apart, the heaviest charge of thirty pounds nitro-glycer'n be'ng at the lower vein, 788 feet deep, the lighter charge at the upper vein. Twelve exploders were ins ?rted in the largest cartridge and eight in the other, forming a train of twenty exploders, which, by means of insulated wire, were connected about 230 feet from the well with an electric battery. Everything being arranged the order was given to fire. In an instant the discharge took place, and a report like a cannon fired from a distance, accompanied by a very perceptible vibration of the earth around, was noticed by those present. The operator and an assistant immediately pulled on the wire, thereby endeavoring to prevent entanglement ; when about fifty feet of the wire had been drawn out a reaction ensued, dragging the parties who were pulling at the wire towards the well for a distance of ten feet, to their surprise and great wonderment (this arose from the column of water lifted by the explosion, and its return fall); but most Certainly the parties thought for an instant Old Scran was hauling them down below, to answer for blasting his oil factory. The result of the explosion on the well cannot bs ascertained until the well has been tubed and the water (a column of 720 feet) has been pumped off. The indications are that so heavy an explosion (the bale of the cartridge which was recovered proved the terrible force exerted) must have penetrated the mud veins for a considerable distance. The operation was entirely satisfactory to all parties, and the ability to safely fire these heavy charges with as much care as fire crackers has been demonstrated.—TitusviMe (Pa.) Her ok"