Practically IMPOSSIBLE TO EXPLODE. Tested to 300 lbs. pressure per square inch. 2-Horse Power, $150, 3 to 4 H.P., $250. Also, Stationary Engines and boilers, and SPARK ARRESTING PORTABLE ENGINES for plantation use. Send for our circular. Discount to the trade. B. W. PAYNE & SONS, Corning, N. Y. SIZING OF COTTON GOODS. Read before the Society of Arts by W. Thompson, F.R.S. A most Full and Clear Description of the process, embracing: An account of the process of Weaving, explaining the object and utility of Size. A table of Sizing Mixtures, in which are enumerated the Substances used: 1, for giving Adhesive properties to Size; 2, to give Weight and Body to the Yarn; 3, for Softening the Size or Yarn; and 4, for Preserving the Size from Mildew and Decomposition. Tests for these Substances, and Directions for Preparing, so as to obtain the results required. Proportions of Sizing. Use of Flour in Size. Weighting Materials, China Clay and its substitutes. "Softenings," and Oils for Softening. East Winds and their effect. Glycerine, Grape Sugar, Mildew Preventives, and Tape Sizing. "Slashing," Packing, Damaged Goods, etc. Contained in SCIENTIFIC AMERICAN SUPPLEMENT No. 80. Price 10 cents. For sale at this office and of all newsdealers. CELEBRATED FOOT LATHES. Foot Power Back-geared Screw Lathes, Small Hand and Power Planers for Metal, Small Gear Cutters, Slide-rests, Ball Machine for Lathes, Foot Scroll Saws, light and heavy Foot Circular Saws. Just the articles for Amateurs or Artisans. Highly recommended. Send for illustrated Catalogues. N. H. BALDWIN, Laconia, N. H. $66 a Week in your own town. Terms and $5 outfit free. H. HALLETT & CO., Portland Maine. SAVE OIL. USE TOMLINSON'S Car Axle Box. Cars run for 3 cents for a thousand miles. See _Car Builder_ for June, 1877. Address J. B. TOMLINSON, 80 White St., N. Y. DAYTON CAM PUMP [Illustration] THE ONLY PUMP IN THE MARKET DESIGNED AND CONSTRUCTED ESPECIALLY FOR BOILER FEEDING. Are Pumping water at 268° F. No Dead Centers. The Steam Valve is a plain Slide Valve, identical to the slide valve of a Steam Engine, but derives its motion from a cam. Speed can be regulated to suit evaporation. Pumping Returns from Steam Heating Apparatus a specialty. --> Send for Circular. Smith, Vaile & Co., DAYTON, OHIO. WHAT 25 CENTS WILL BUY! THE SCIENTIFIC AMERICAN REFERENCE BOOK. PRICE TWENTY-FIVE CENTS. This is a most useful Little bound book of 150 pages, comprising, probably, the most extensive variety of standard, practical, condensed information ever furnished to the public for so small a price. Contents: 1. THE LAST CENSUS OF THE UNITED STATES (1870), by States, Territories and Counties. IN FULL, showing also the area in square miles of each State and Territory. 2. TABLE OF OCCUPATIONS.--Showing the occupations of the people of the United States, and the number of persons engaged in each occupation. Compiled from the last census.