We learn by the Pottsville Register, that a new locomotive, the invention of Mr. Dem phul, has been tried on the Philadelphia and Reading Railroad, and with such suc cess as to save one half the fuel of the Wi-Stirnfifit amait4U. Illlprove4 Churn. Mr. O. W. Wilkinson, of Fayette, Seneca County, N. Y., has invented a new improve ment in the construction of a chum agitator, for which he has taken measures to secure a patent, and which is stated to operate most beautifully. The dashers are seton a

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... horizon tal shaft, running through the churn, into which are fixed blades, or distinct arms, ea.ch the sec tion of a screw. This form of dasher is said New Ink. nant Engines. It is for burning anthracite to prodRce the butter in a very short period, is coal :_ worked with great ease, and brings a better S. French, corner of Nassau and Spruce streets, this city, has shown us a newly in vented ink, by which a copy of a letter writ ten with it can be taken in a short "pace of time without the aid of a copying press. We saw the operation performed, and Can really commend it as a great desideratum for busi Iless men, and to all who desire to keep copies of their correspondence. It has heen secured by letters patent in England, and measures are about to be taken to secure it in thi" coun_ try. "The boiler of the new Engine forms as it result, in a greater quantity of butter, than were a cylindrical hollow-square, open only many other churns. in front. Instead of the fire passing through ==== == == == == == == == == == == == == == == == == = tubes, a series of 2!\ wide tubes con neet the bock of the boiler with the top. They are curved over the centre of the fire which plays freely all through them. They are filled with water, which enters from the back portion of the angular boiler and is driven with great f@rce up in to the top of the same continuous cham ber. These tub')s run well up into the dome and penetrate the inner boiler, leaving no external joints exposed to the fire. It is demonstrated that this arrangement gives steam more quick ly with one half the fuel usually consumed." It has also a new blower to throw b",ck up on the fire the fine particles of carbon which are in general driven up the smoke pipe. This is a good idea-all our steamboats should have one. This engine is to be (or is now) with drawn from the road, owing to the impossibili ty of the inventor and the company coming to terms-the patentee asking too much for the use of his invention. The following comments of the Register are worthy of special atten tion by a very great number of our readers . "The inventor of this Engine has an idea that it will revolutionize the earth a.nd that his patent right is invulnerable and ineva.dable and no reasonable negociation can be made with him. We know enough of Rugines to per ceive that every separate thing claimed as new is now in use and that if he can hold exclusive right to anything he will be rigidly con_ fined to his particular combination and ar rangement, which cannot escape evasion. Our readers who understand the principles of Montgomery's patent boiler will see tha.t the main novelty in Demphul's is but a slight va riation from the form of the other. Montgom ery's boiler increases the the steam making power 40 per cent. from a given quantity of fu el. But, we a.re equa.lly confident that if some such a Bum as $100,000 would satisfy him, he could get it by sales of his rights, whether valid or not 10 persons who willingly pay in such cases what is liberal and as savagely re sist demands that are preposterous and oppres sive. The Battins had a lesson on that sub ject which Mr. Demphul might study with profit. He would now be selling rights to man ufacture coal-breakers at $100 a piece and putting thousands per annum into his pockets if that had sufficed. But reason forsook him ; opposition found his invention was not origi nal and so the Supreme Court decided." ---=� c=:::=--Stereolale Cloth. We have received a sample of this kind of cloth from P. S. Devlan of Rea.ding, Pa., who brought it with him from England during his recent visit to Europe. This kind of cloth, is dyed in a different manner from the old way and is also finished by a different process. The color (black) is not affected by sulphuric acid and its finish is as superior to that by the old way, as can well be imagined. It is manu factured by Gibson, Ord & Co., Leeds, and we must say, they have made a great improve ment in the manufacture of 1roadcloth. We have a sample of cloth, dyed and finished in the old way, ma.de of the same wool, and the difference is very striking. The Stereolaic is soft, lustrous, and will not shrink Or spot with rain, and the nap is so closely laid that it is impermeable to dust. � Ne� Tent. A new tent, on an improved plan, has just been constructed by Mr. J. H. Landell, sail maker, of Newark, N. J., which combines many advantages over the" wall tent," now in use in the army. It is circular in form., ca-� pable of accommodating a much larger num llih ber of persons, and hence proportionately ;t;� th, ton, ,=m"l, ,""'. IMPROVED PLOW.---Figure 1. Th�se two engravings represent . a new and I while it will completely tnrn over the land, it beautIful plow-constructed and mvented by will do so by throwing it over with a rolling �r. T.Ba�er of Troy, �.Y. Figure 1 . i � a jmoti on-the easiest Of , all for the farmer and sIde elevatIOn, and fi g. 2 IS a top or plan vIew his 'team. Another new feature about this (looking down on it.) Figure 1 is slightly plow is the beam. It is made of metal, either thrown up to show the bottom. The same letwhole or in sections, and is hollow. This ters refer to like parts on both of the figures. makes it of the least possible weight, with the A are the stms or handles; B is the mould greatest possible strength. The whole form of board; C is the shear; D is the beam; :Ii: is this plow is peculiarly beautiful, and along the coulter; G is the recesses to receive the with this we may justly expect that its opera lower ends of the handles, The handles pass 'tive qualities will be equal to its appearance. through the guide bar, H (fig. 2.) The con-More information may be obtained by letter struction of the mould board is peculiar. This addressed, post-paid, to Mr. Baker, No, 509 is best shown in figure 2; it has a gradual FIG. 2. curve towards the back end, to turn the land completely over. In plowing sward every turf will be completely turned, as the mould board will lay the sward over at right angles to the perpendicular cntting point. The extremity of the tuming angle of the mould board, is at such a gradual curving distance from the plow point, that it must work easy-its form being River street, Troy, who has ta.ken measures to based upon the solid of least resistance j and secure it by patent. Ne"!, Oyster Opener. twinkling. By this instrument a person may open at least four times more oysters in the same space of time, than by the common mode, and do it in a more cleanly manner. This instrument is the invention of M. Picault, a French gentlema.n of Paris. ---= = Reg Ister Hygrolll eter. At one of Lord Rosse's recent scientific soirees, Mr. Appold exhibited his cnrious Re gister Hygrometer for keeping the atmosphere of the house at one regular moisture. The in strument with a varia.tion at one degree in the moisture of the atmosph'll re opens a valve ca. pable of supplying ten quarts of water per hour; delivering it to pipes covered with blot ting paper heated by a ga.s stove, by which the water is evaporated until the atm0sphere is sufficiently saturated and the valve thereby closed. A lead pencil is attached to register the distance the hygrometer travels; and ihNs a sheet of paper moved by clock-work shows This instrument in our oyster-eating counthe difference between the wet and dry bulbs try will no douut receive that attention which of the thermometer at any period of time. it deserves, and as it is free property, any one I ---==--may get up one to suit himself. A is a . A Uset'ul Machine. joint which unites the two jaws; B is the chi-A patent has been granted to Daniel D. Gitt sel, or opener, which is secured in a socket of Butler township, Adams Co. Pa., for a ma fixed on the left jaw, and can be set in and ta-chine which it is believed will be of great ser ken out at pleasure, a set screw being used to vice to farmers-i t is a simple machine to dis fasten it, or the socket may have an interior lodge, and convey into the furrow, the rubbish thread, and on the inner end of the chisel bemade which collects upon the coulter or cutter of the a screw to fit into it. C is the oyster; E is a plough, in the operation of ploughing; it is recessed cheek fixed on the right jaw to hold worked by a lever attached to the handle of the the oyster ; D D are the two handles Or levers . plough. The manner of opening the oyster, in other One jerk of the lever by the hand of the words, using this instrument , is represented so ploughman, while the plough is in progress, clearly, that "he who runneth may read," and will dislodge all rubish which may have ac underAtand. It operates like a nut cracker: cumulated, t. hm saving the necessity of having By placing the oyster in the cheek, E, then a boy h follow, or stopping frequently to clean bringing the lmife 011 the peculiar spot, as, the plough. For the plowing of large grass shown, of the oyster, and bringin g the two lands, such an arrangement in much required h andles together, the shell is opened in a by farmers. © 1850 SCIENTIFIC AMERICAN. INC New Method 01' RefinIng Gold. Prof. Richard S. McCulloch, who fills the chair of Natural Philosophy at Princeton Col lege, and who previously held the office of meJt.er and refi ner of the U. S. Mint, has ad dressed a letter to the Secretary of the Trea sury, in whieh he states that he has discover e,d a new, quick and economical method of re fining argentiferous and other gold bullion, wheraby the work may be done in one-half the present time, and a large ea ving effected in interest upon the amount which is currently refined, and withdrawn for that purpose from the use of the depositor, or from the Treasury by advances for his accommodation. The wri ter adds, that "in labor and materials this new method would also save about ,;me-half of the cost required by the process now used in the Mint of the United States; so that the charge to depositors for refming, which now is, as by law directed, fixed at the actual cost thereof, may be considerably reduced. The apparatus is less costly and more compact than that used in either of the methods now em ployed. The ad vantages in respect to space are such that probably five times as much work as at present ma,y be dune in the same bnilding. In the Mint at Philadelphia ten millions of dollars per month may be refined, ,and the sum of $l,OOOwodd, I believe, cover the cost of the alterations and apparatus re quired." Rellllngton's Bridge. On Wednesday last week, we examined the model of this bridge now on exhibition in this city. We do not wish to say much about it at present, as we may be able to present an engraving of it at some other time. Suffice it to say that it appears to be one of the most simple bridges ever designed, for cheapness of construction according to the length of span. The model is 160 feet in the clear, composed of four stringers of a little over two inches square at the abutments, and tapering to about an inch square at the centre. It is of the form of an inverted arch. The stringers are made of several pigces of white pine joined together by a scarfe joint; their ends, when they are, joined, being bevelled at a very slight angle, :and the bevelled parts lapped over each other, and attached with glne, so that when united, each stringer a.ppears to be a continuous and single piece. These joinings are so arranged as that only one of them ever occurs in the same cross section of the bridge, and they are neither bolted nor clamped, but depend entire ly upon the glne for their adhesion. Each of these stringers have about nine feet bearing on the at.utments or suspension piers, to which they are firmly attached by iron bolts. Water versus Stealll Power. vVe have enquiries often made of us respect ing the relative values Qf steam and water power-enquiries which we find ourselves un able always to answer, owing to the question being one wholly of practical economy ; in other words, determined by fair experience. If any of our correspondents are in possession of clear, defined results, respecting the compara tive economical merits of these two powers, they will do us and the public a benefit by furnishing us with the said inform ation. Wheellng Bridge. Chancellor Wallworth, to whom the Wheel ing Bridge case was referred by the United States Supreme Court, has submitted to the Court that the Brid ge is a nuisance. What is now to be done? Will the Bridge have to be taken down, or the piers raised so high as to allow unobstructed progress to the tallest fun nels of Steamboats on the Ohio. Since the explosions at Brooklyn and Phi ladelphia, this old mooted question is being revived wIth fury and fume. Getlemen, we say , don't write abont what you don't know, but mind the old advice, "prove all things, hold fast that which is good." Erratutn. On the 10th and 11th Jines of the second column of page 341, for" water entirely into oxygen at the one pole, and entirely into oxy gen at the other," read entirely into hydrogen at one pole, and entirely into oxygen at the other.