PATENT CUTTERS for the Teeth of Gear Wheels, which can be sharpened by grinding, without changing their form. Cutters made on this plan will last many times as long as those of the common form, with the advantage of being always ready for use. Descriptive circular, with price list, sent per mail on application. BROWN & SHARPE M'F'G CO., Providence, R. I. * * * * * A SPRING OF WATER AT THE TOP OF THE HOUSE. HOUGHTON'S AUTOMATIC WATER ELEVATOR, patented Feb. 7, 1871, No. 111,542, delivers water from the well or cistern in the tank at the top of the house. Is operated by the fire in the kitchen range without additional fuel; is simple in construction, reliable and cheap. Reliable parties wanted to introduce them into use in all the States except New England. For drawings and full description address CHARLES HOUGHTON, 41 State St., Boston, Mass. * * * * * SHORT HAND.--150 words per minute in four weeks. Send stamp for Circular. PROF. GRAY, P. O. Box 4847, New York. * * * * * WATCHES THAT ARE WATCHES. WE SHALL BE PLEASED TO SEND OUR DESCRIPTIVE PRICE LIST OF GENUINE WALTHAM WATCHES, TOGETHER WITH AN ILLUSTRATED PAMPHLET ENTITLED A HISTORY OF WATCHMAKING, TO ALL WHO SEND US THEIR ADDRESS. NO MATTER HOW REMOTE YOU ARE FROM NEW YORK, WE CAN SELL YOU A WATCH AT THE SAME PRICE AS IF YOU WERE HERE. WHEN YOU WRITE MENTION THAT YOU SAW THIS NOTICE IN THE SCIENTIFIC AMER. HOWARD & CO., 865 BROADWAY, N. Y. * * * * * ENGINES, TOOLS, MACHINERY, ETC., FOR SALE AT THE NOVELTY IRON WORKS, FOOT OF EAST 12TH STREET, NEW YORK CITY, EMBRACING Engines, Planers, Lathes, Smith and Boiler Makers' Tools, and Machinery and Patterns of the most approved kinds, etc. Also, 1 High Pressure Engine, 12-inch diameter by 30-inch stroke: 2 Stevenson's Patent Turbine Water Wheels, 66-inch diameter, and 1 Marine Beam Engine, 60-inches by 10-feet stroke. Send for catalogue. JNO. S. SCHULTZE, RECEIVER OF THE NOVELTY IRON WORKS. New York, March 1, 1871. * * * * * FOR CIRCULAR ILLUSTRATING A NEW and greatly improved TURBINE WHEEL, believed to be the best and cheapest in the market, apply to PUSEY JONES & CO., Wilmington, Delaware * * * * * HOTCHKISS BRICK AND TILE MACHINE.--Send for Circular to Room 7, No. 19 Cliff street, New York. * * * * * PRATT'S ASTRAL OIL: Not the cheapest, but the best Illuminating Oil ever made. Does not take fire or explode if the lamp be upset or broken. Over 100,000 families continue to use it, and no accidents of any description, directly or indirectly, have occurred from it. Oil House of CHARLES PRATT, Established 1770, New York. * * * * * UNION SPOKE WORKS. SPOKES, RIMS, AND PLOW HANDLES. All goods warranted seasoned, and of the best quality.