RECEIPTS—When money is paid at the office for sub scriptions, a receiptforit willalways be given ; but when subscribers remit their money by mail, they may consider the arrival of the first paper a bonajide acknowledgment of the receipt of their funds. The Post Office law does not allow publishers to enclose receipts in the paper. PATENT CLAIMS—Persons desiring the claim of any invention which has been patented within, fourteen years, can obtain a copy by addressing a letter lo tliia office,stating the name of the patentee, and date of patent when known, and enclosing $1 as fee for copying. Terms of Advertising Twenty-five cents per line each insertion. Were-pectf ully request that our patrons will make their advertisements as short as possible. Engravings cannot be admitted into the advertising columns. ** All advertisements must be paid for before inserting. Important to Inventors A MERICAN AND FOREIGN PATENT J\ SOLICITORS—Messrs. MUNN &CO., Proprietors of the SCIENTIFIC AMERICAN, continue to procure patents for inventors in the United States and all foreign countries on the most liberal terms. Our experience is of twelve years* standing, and our facilities are un-equaled by any other agency in the world. The long experience we have had in preparing specifications and drawings has rendered ua perfectly conversant with the mode of doing business at the United States Patent Office, and with most of the inventions which have been patented. Information concern ing the patentability- of inventions is freely given, without eharge, on sending a model or drawing and description to this office. Consultation may be had with the firm, between nine and four o'clock, daily, at their principal office. 128 Fulton street, New York. We have lately established a Branch Agency on the corner of F. and Seventh streets, Washington (opposite the United States Patent Office). This office is under the general superintendence of one of the firm, and is in daily communication with the Principal Office in New York, and personal attention will be given at the Patent Office to all such, cases as may require it. We are very extensively engaged in the preparation and securing of patents in the various European countries. For the transaction of this business we have offices at Nos. 66 Chancery lane, London ^29 Boulevard St Martin, Paris; and 26 Ruedes Eperonmers, Brussels. We think we may safely say that three-fourths of all the European patents secured to American citizens are procured through our Agency. Circulars of information concerning the proper course to be pursued in obtaining patents through our Agency, the requirements of the Patent Office, c, may be had gratis upon application at the principal office or either of the branches. Communications and remittances should be addressed to MUNN &COMPANY, No. 128 Fulton street, New York. The annexed letter from the late Commisaioner of Patents we commend to the perusal of all persons interested in obtaining patents :— AIESSRS. MUNN &Co.—I take pleasure in stating that while I held the office of Commissioner of Patents, MORE THAN ONE-FOURTH OP ALL THE BUSINESS OP THE OFFICE came through your handB. Ihaveno doubtthat the public confidence thus indicated has been fully deserved, as I have always observed, in all your intercourse with the Office, a marked degree of promptness, skill, and fidelity to the interests of your employers. Yours, very truly, CHAS. MASON. SECOND-HAND MACHINISTS' TOOLS— Viz., Engine and Hand Lathes, Iron Planers, Drills, Chuck Lathe, Gear Cutter and Vises, all in good order, and for sale low for cash. Also one new first-class Woodworth Planing and Matching Machine. Address FRANKLIN SKINNER, Agent, 14 Whitney avenue. New Haven. Conn. MODEL MAKER—A FRENCH CLOCKMA-ker of much experience offers his services for the manufacture or jobwork of any kind of clockwork, or any kind of small mechanical contrivances. Also models and mechahical drawings neatly executed. I. KONVAL1NKA, No. 230 12th st., near Ave. A, Room 14, New York. GAS WORKS-E. A. COEN, ENGINEER and Contractor for the erection of Coal Gas Works. Plans and specifications furnished, and works erected for cities, villages, factories, c. Gas Works altered and repaired. Residence, Rondout, Ulster coM N. Y. IRON PLANERS AND ENGINE LATHES of all' sizes, also Hand Lathea, Drills, Bolt Cutters, Gear Cutters, Chucks, c. on hand and finishing. These tools are of superior quality, and are for sale low for cash or approved paper. For cuts giving full description and prices, address u New Haven Manufacturing Co., New Haven, Conn." SD. BARNETT, MALLEABLE AND GREY Iron Foundry, Hamilton, corner of McWhorter st. Newark, N. J. Orders promptly attended to. EA. COEN—ENGINEER AND CONTRACTOR for the erection of Coal Gas WorXs. Plans and specifications furnished, and works erected for cities, villages, factories, c. Gas works altered and repaired. Western office, Jackson, Mich. Residence, Eondout, Ulster county, N. Y. Eastern office, Carmine and Bedford sts., New York. "CiCCENTRIC SCREW AND GRIPPING Aid WRENCH—Hyde's patent—for sale by all hardware stores. Proprietors, GRAY BROTHERS, New York City. TO INVENTORS AND PATENTEES—H. BOEHMEE would respectfully notify the above, that he is prepared to manufacture and execute all orders for models or scientific inatruments at the shortest notice, and on moat reasonable terms. H. BOEHMER, 69 Fulton St., New York. THE SUBSCRIBER HAS ESTABLISHED the manufacture of his Self-straining Saw Mill Irons, at Chicago, 111. Letters addressed to him at Chicago for the next three weeks will receive personal and prompt attention, if accompanied with a stamp. July 6,1858. S. E. PARSONS. HARRJLSON'S-20 AND 30 INCH GRAIN Mills constantly on hand. Address New Haven Manufacturing Co., New Haven, Conn. FOR SALE-AN 8-HORSE UPRIGHT Engine, Boiler, and fixtures, second-hand (nearly new), all in good running order. Address H B. MATHER, West Norwalk, Conn. 5(\(\(\ AGENTS WANTED —TO SELL jUUU four new inventions. Agents have made over $25,000 on one. Better than all other similar agencies. Send four stamps and get eighty pages particulars, gratis. EPHRAIM BROWN, Lowell, Mass. EVERY MILLWRIGHT, ALL MILL-OWNERS, and those interested in hydrodynamics, should become acquainted with the merits and principles of the improved Fourneyron Turbine Water Wheel, or the " Universal Turbine," a wheel the most economical in the use of water, and giving the highest percentage, with a partially raised gate, of any yet discovered. It gives from 75 to 97 per cent of power, according to the size of wheel and head employed. For information address S. K. BALDWIN, Laconia, N. H. N. B__For low falls of one, two, or three feet, also for any fall, it will surpass all others. BALLOONS FOR THE FOURTH OF JULY —Illuminated and tri-colored—a great amusement. Size from 6 to 20 feet circumference. Price from 50 cents to $3 each. Address I. S. CLOUGH, Sole Agent, No. 231 Pearl street, New York. WOODWORTH PLANING MACHINES, Mortising, Tenoning, and Sash Machines, and a full assortment of wood-working machinery, at ereatly reduced prices. Address CHARLES H. SMITH, 135 North Third st, Philadelphia, Pa. CJECOND-HAND MACHINERY AT VERY lo low prices for cash.—Steam Engines, Slide Lathes, Planing Machines, Drills, Slotting Machines, c.; also a variety of Mortising, Tenoning, and Sash Machines, c, all warranted in good running order. Address CHARLES G. WILLCOX, 87 North Third st., Philadelphia, Pa. SLIDE LATHES, IRON PI.ANERS, UP-right Drills, Slotting and Boring Machines, Universal Chucks, and a large assortment of machinists' tools, at greatly reduced prices. Address CHARLES H. SMITH, 135 North Third st., Philadelphia, Pa. REED'S PATENT PORTABLE AND STATIONARY STEAM ENGINES, unequaled lor simplicity, durability, and economy. Birkbeek's improved Steam Pumps, Portable Steam Saw and Grist Mills ; second-hand engines and boilers. Most improved machinery of all kinds, furnished by JOHN A. EEED, No. 172 Broadway, corner of Maiden Lane, New York City. TJELTING AND PACKING—Niagara Falls JJ Paper Manufacturing Co., Niagara Falls, April 20, 1858. United States Gutta Percha Co. : We duly received the Gutta Percha Belting ordered from you, and after giving it a thorough test the past wintert on our heaviest engines, constantly exposed to water, ice and oil, and making 140 to 160 revolutions per minute; and again on two of our largest "Gwynne Pumps," making from 600 to 700 revolutions per minute, they have given us entire satisfaction, and vre think it decidedly the best belting we ever used, and you may look for our future orders as required. S. PETTIBONK, Treasurer and Superintendent. For sale by the UNITED STATES VULCANIZED GUTTA PERCHA CO., No. 66 Liberty street, New York. FIFTH EDITION—CATALOGUE CONTAIN-. ing 250 illustrations of Mathematical, Optical and Philosophical Instruments, with attachment of a large sheet representing the Swiss instruments in their actual size and shape, will be delivered, on application, to all parts of the United States, by sending 12 cents in postage Btamps. ' C. T. AMSLER, No. 635 Chestnut st., Philadelphia. NEW ORLEANS-VOSE &WEST, Commission Merchants for me saleof Machinery, Agricultural Implements, c, New Orleans. Refer to W. P. Converse &Co., 42 Pine street, New York. WTATER WHEELS^VANDEWATER'S BI-TT proved Jonval Turbine Water Wheel is now manufactured in the best manner by MASON &BLAKENEY, Springfield, Ohio. Also Otetot's Saw Gummer. Address as above. CJELF-ACTING WOOD-TURNING LATHES lo —A. Warth's patent having been three years in. practical operation, and greatly improved, is now the most perfect, simple, practical lathe in use, giving general satisfaction. One boy, in most kinds of work, can operate two lathes, and accomplish the work of four men in the best manner. Address CARPENTER &PLASS, 479 First avenue, New York City, sole manufacturers; or for county or State rights A. YVARTH, 23 Chambers street. New York City. Also a general assortment of machinists' tools on hand. Circulars sent on application. PORTABLE STEAM ENGINES. — S. C. HILLS, 12 Platt street, New York, offers for sale these Engines, with Boilers, Pumps, Heaters, etc., all complete, suitable for printers, carpenters, farmers, planters, c. A %H horse can be seen in store ; it occupies a space 5 by 3 feet; weight, 1,500 lbs. ; price, $240. Other sizes in proportion. STEAM ENGINES, STEAM BOILERS, Steam Pumps. Saw and Grist Mills, Marble Mills, Rice Mills, Quartz Mills for gold quartz, Sugar Mills, Water Wheels, Shafting and Pulleys. The largest assortment of the above in the country, kept constantly on hand by WM. BURDON, 102 Front street, Brooklyn, THE WORKS OF THE AUBIN GAS CO., (General Office, No. 44 State st., Albany, N. Y.,) as now perfected, are adapted to all materials and localities, and are m successful operation in villages, factories, and private dwellings. For full information as to cost, probable income ol public works, c, apply as above. For plans, c, see SCIENTIFIC AMEEIOAN of March 13th. MACHINE BELTING, STEAM PACKING, ENGINE HOSE__The superiority of these articles, manufactured of vulcanized rubber, is established. Every belt will be warranted superior to leather, at one-third less price. The Steam Packing is made in every variety, and warranted to stand 300 degs. of heat The nose never needs oiling, and is warranted to stand any required pressure ; together with all varieties of rubber adapted to mechanical purposes. Directions, prices, c, can be obtained by mail or otherwise, at our wareheuse. NEWYORKBELTING- AND PACKING COMPANY. JOHN H CHEEVER, Treasurer, No. 6 Dey street, Nety York. PECK'S PATENT DROP PRESS—FOR Jewelers, tin and copper workers, gun and other forgings, c, manufactured by the patentee, MILO PECK &CO., New Haven, Conn. These machines have no rival.—[Scientific American. WHEELER &WILSON'S SEWING MACHINES, 343 Broadway, New York, received the highest premiums awarded in 1857 by the American Institute, New York; Maryland Institute, Baltimore ; and at the Maine, Connecticut, Illinois, and Michigan State Fairs. Send for a circular containing editorial and scientific opinions, testimonials from persons of the highest social position, c. LAP-WELDED IRON BOILER TUBES— Prosser'sPatent.—Every articlenecessaryto drill the tube-plates and set the tubes in the best manner. THOS. PROSSER &SON, 28 Platt st., New York. WOODWORTH PLANERS-IRON FRAMES to plane 18 to 24 inches wide—at $90 to $110. For sale by 8. C. HILLS, 12 Platt street New York. A NDREWS' CENTRIFUGAL FORCE AND -A. Suction Pumps—Illustrated in Scr. AM., October 24,1857. Sizes, from 60 to 4,000 gallons per minute. Larger sizes made to order. Pump, sand, gravel, coal, paper pulp, c. and for simplicity, durability, and economy of power, are superior to any pump made. WILLIAM D. ANDREWS, No. 414 Water st., New York. PHILADELPHIA RIVET WORKS—MANU-facturers of the celebrated P brand. Boiler, tank, and gasometer rivets, of every diameter, length, and head. PHILLIPS &ALLEN. ^LARK'S REGULATOR-FROM TEN TO V^ twenty-five per cent saving in "fuel is guaranteed in the use of Clark's Patent Steam and Fire Regulators ; besides giving the most perfect regularity of power at any desired pressure, and no fear of explosions. Send for circular at 229 Broadway, New York City. E. R. PRATT, Secretary. CIRCULARS WITH CUTS, ILLUSTATING Vy steam engines andmachinery for making lumber, shingles, staves, heading chairs, bedsteads, and wheat-cleaning machinery, bran dusters, c. sent for a postage stamp, by applying to L. A. SPALDING, Lock-port, N. Y. T^NGRAVING ON WOOD AND MECHANIJli CAL DRAWING, by RICHARD TEN EYCK, Jr., 128 Fulton street.New York, Engraver to the Scientific American. PAGE'S PATENT PORTABLE CIRCULAR SAW MILL, and Portable Steam Engines and Boilers mounted on substantial wheels, ready to saw-lumber, thrash wheat or gin cetton. Our Mills will saw from 2,000 to 10,000 feet per day. Address GEO. PAGE &CO., Baltimore, Md. "WOODWORTH PLANING MACHINES.— T T Having over $40,000 worth now completed, I will sell, from this time henceforth, at a very reduced price, and am ready to construct any sizes not on hand at short notice. JOHN H. LESTER, 67 Pearl st., Brooklyn, Long Island. INDUSTRIAL MUSEUM —CONTRIBUTIONS ol new and valuable machines, merchandize, and specimens of fine art are most respectfully solicited at No. 5 Washington street, Boston, Mass. I. S. RICHARDSON. f~|IL! OIL I OIL!—FOR RAILROADS, STEAM-VJ ERS, and for machinery and burning. Pease'a Improved Machinery and Burning Oil will save fifty per cent., and will not gum. This oil possesses qualities vitally essential for lubricating and burning, and found in no other oil. It is offered to the public upon the most reliable, thorough and practical test. Our most skillful engineers and machinists pronounce it superior and cheaper than any other, and the only oil that is in all cases reliable and will not gum. The Scientific American, after several tests, pronounced it "superior to any other they have ever used for machinery." For sale only by the inventor and manufacturer, F. S. PEASE, 61 Main st., Buffalo, N. Y. N. B—Reliableordersfilled for any pa rt of the United States and Europe. "V AIL'S SPEEDWELL IRON WORKS, 1 Morristown, N. J., manufacture Craig's Patent Double-acting Balance Valve Oscillating Steam Engines both stationary and portable, Knowles* Patent Muley, Portable, Gang and Re-sawing Mills, Sugar and Chinese Cane Mills and Sugar Pans, Grist Mills, Mill Irons, Rich's Water-wheels, Forgings and Castings. Orders for the above, and all descriptions of labor-saving ma-chinerv will receive prompt attention. JOHN H. LIDGERWOOD &CO., No. 9 Gold street, New York. i^ORLISS* PATENT STEAM ENGINES— V/ About 250, most of them from 40 to 400 hors e pow er, are now in operation. On application, pamphlets will be sent (by mail), containing statements of responsible manufacturing companies where these engines have been furnished, for the saving of fuel, in periods varying from 2K to 5 yeara. Boilera, shaftin g, and gearing. CORLISS STEAM ENGINE CO., Providence, R. X PATENT OFFICE .MODELS CAREFULLY made on scientific principles, at low prices, by H. / SHLAEBAUM &CO., 300 Broadway, New York. Kef-J| erenceeat the office of this paper.