NEW OTTO SILENT GAS ENGINE. Working without Boiler, Steam, Coal Ashes or Started by a match it gives full power immediately. WHEN STOPPED, ALL EXPENSE CEASES. No Explosions, no Fires nor Cinders, no Gauges, no Pumps, no Engineer or other attendant while running. UNSURPASSED IN EVERY RESPECT for Hoisting in Warehouses, Printing, Ventilating, Running Small Shops, etc. 2, 4 and 7 H. P. and upwards. Built by SCHLEICHER, SCHUMM & CO., 3045 Chestnut Street, Philadelphia. Boston Agency, HILL, CLARKE & CO., 36 and 38 Oliver St. nov '80 ly New York City Agency, A. C. MANNING, 38 Dey Street. Awarded First Premiums at the Franklin Institute, 1874, and International Exhibition, 1876, and Elliot Cresson Gold Medal by Committee on Science and the Arts, 1881. LOUIS H. SPELLIER, Practical Watch & Clock Maker No. 235 NORTH EIGHTH STREET. Fine Watches and French Clocks carefully and promptly attended to POSTMASTERS and others specify what vou wish and send 3-cent stamp for circulars and EW BRASS, or RUBBER for Post Offices, Banks, Z MAY 5 etc. SEAL PRESSES, DIES, DATES, Etc. 6. P.M. ORK N.Y 79 (24) J. GOLDSBOROUGH, 720 Chestnut St., Phila. The finest Wood Engraving nov '80 ly A. M. COLLINS, SON & CO., Printers', Stationers' and Fhotographers' -CARD WAREHOUSENo. 513 Arch Street, PHILADELPHIA. dec '80 ly STEEL CASTINGS dec. 's ly From 1-4 to 10,000 Pounds Weigh'. True to pattern. sound and solid, of unequaled strength toughness and durability. Supe jor in strength and durability to iron forgings in any posi ion, or for any service whatever. Gearing of all kinds, Snoes, D.es, Hammerheads, Cros:heads for Locomotives, etc. 15.000 Crank Shaft- and 10,000 Gear Wheels of this CRANK SHAFTS AND GEARING specialties. CHESTER STEEL CASTINGS COMPANY, Works, CHESTER, PA. 407 LIBRARY ST., PHILA. Repairs to Corliss and Other Steam Engines a Specialty. Cylinders re-bored in their Present Positions from 3 to 110 inches in diameter. Also, all makes and sizes of Steam Hammers and Blowing Engines. GENERAL MACHINE WORK, SPECIAL TOOLS FOR RAILWAY REPAIR SHOPS. L. B. FLANDERS. MACHINE WORKS 1025 Hamilton St., Philad'a, Pa. New Descriptive Circulars on application. dec '80 1 STOW FLEXIBLE SHAFT CO. (LIMITED), Sole Manufacturers for cther than Dental Purposes, Of the Stow Flexible Shafts, and Tools and Machines operated therewith. COMPLETE AND TRULY PORTABLE TOOLS For Drilling, Tapping, Boring and Reaming in Metals, Boring, Grinding, Sand Papering and Polishing in Wood, Stone and Marble, Buffing, Polishing and Emery Grinding, Clipping and Brushing Cattle and Horses, Stove Polishing, etc., etc. Send for Circular to 1505 to 1509 PENNSYLVANIA AVENUE, PHILA., PA. jan 81-1y zens. Established 1840. MERSHON Patent Shaking GRATE A Fuel, Time and Labor Saver. This Grate can be Adjusted to any Heater, Steam Boiler or other Fire Apparatus. It is the most complete, economical and easiest working Grate ever invented. No doors opened when raking the fire; no dust coming out; no poker required; any kind of fuel can be used. A child can rake the largest heater fire with it. It surpasses anything of the kind ever invented. Numerous testimonials shown from some of our most influential and leading citiWe respectfully refer to the following gentlemen of Philadelphia, whom are a few using this grate: Hon. George H. Boker, Joel J. Baily, Charles S. Bradford, Thomas P. Cope, George M. Coates, S. Delbert, S M. Elliott, F K. Hipple, John J. Kersey A. L. Massey, Dr. Joseph Paxon, J. T. Williams, Louis Wagner, Francis C. Yarnall. Wrought Iron Heaters, Cooking Ranges, Portable Heaters, Patent Metallic Gas Logs for Imitation of Wood Fires, etc., etc. DAN'L MERSHON'S SON, Pennsylvania Heating and Ventilating Works, N. W. COR. TWELFTH AND FILBERT STS., PHILADELPHIA, PA. jan81 ly No dead center, perfectly balanced, very high speed, steam-tight working, economical in fuel, perfect expansion system, minimum wear, occupies small space, small weight, self-lubricating when running. All working parts finished in the lathe. Low price. Unsurpassed for Steamboats, Dynamo-Electric Machines, Hoisting Machinery, Centrifugal Pumps, Fans, Circular Saw Benches, Threshing Machines, Metal Saws, Rolling Mill Trains, etc. Manufacturing right for sale. Apply to jan '81 ly Dr. H. A. W. LINDEHN, 330 N. 7th St, Phila. ESTABLISHED 1845. GEO. C. HOWARD, ENGINEER AND MACHINIST No. 15 South Eighteenth St., Philad’a. HOISTING MACHINERY. Hydraulic, Worm and Spur-Gear Elevators, Lifts and Hand Hoists, METAL WORKING MACHINERY for Machinists, Blacksmiths and Boilermakers. GRINDERS FOR SHEARS, CARDS, ROLLS, &C. TESTING MACHINES for Strength of Materials, Paper, Cloth, &c. STEAM, GAS AND AIR ENGINES, Engine Repairs. Cylinders and valves bored and surfaced STEAM HEATING. SHAFTING, Pulleys, Hangers and Gearing, Water Wheels and Pumps. PUNCHING, CUTTING, PERFORATING AND FORMING MACHINERY. PAPER MACHINERY, Chilled and Soft Iron and Paper Roll Calenders, Making and Drying Cylinders, Dandy and Beater Rolls and Paper Knives. PRINTING MACHINERY, Power and Hand Plate Presses with Plain and D Rolls and Ruling WIRE MACHINERY for Drawing, Weaving, Crimping and Cutting Wire, Punches, etc. STREET SWEEPING MACHINES, for one or two horses, for lifting the dirt, putting it in piles or leaving it in windrows. HAND AND STEAM PUMPS. Belt Gearing for Sewing Machines and others requiring variable speeds. CONSTRUCTION AND REPAIRS. We give personal attention to these branches, aiming to secure the best results to our customers. jan '81 ly The "Sun Dial" Gas Cooking Stoves. We claim for these stoves the following advantages over other methods of cooking: 1st. More healthful through the absence of waste of heat, soot, smoke, dust and smell. 20. More certain, by the rapidity of manipulating, in consequence of the simplicity of construction. 3d. Less troublesome, requiring very little attention during the process of cooking. 4th. Less expensive. 5th. Less wasteful; through loss of weight, the juices and fat, instead of being separated, as is the case in ordinary process, remain thoroughly incorporated with the meat, a point of great importance in a nutritive as well as economical sense. 6th. The adoption of the most perfect burners in all the apparatus, whether for heating or cooking purposes, discovered by scientific research. MANUFACTURED BY THE GOODWIN Gas Stove & Meter Co 1016 Filbert St., Philad'a, and 142 Chambers St., N. Y. anay '81 6m VAN NOSTRAND'S ENGINEERING MAGAZINE COMMENCED JANUARY, 1869, PUBLISHED ON THE 15th OF EACH MONTH, AT $5.00 PER YEAR, Consists of original contributions on all branches of Engineering Science, and selected articles from the leading Foreign Journals. It is designed that each number shall contain valuable papers relative to the different departments of engineering labor. Space will be given to short discussions or elucidations 1 important formulæ, especially such as have proved valuable in the practice of the working engineer. Our facilities for affording such items are extensive and increasing. The original contributions hereafter will form the most prominent feature, but articles selected and condensed from the English, French, German and Austrian engineering pericdicals will continue to occupy a position as before, and will contribute to make this Magazine valuable to the engineering profession, too valuable, in fact, for any of our leading engineers to be without. It will continue to occupy the same high position in this respect that it took from its commencement. Cloth covers for Volumes I. to XIX. inclusive, elegantly stamped in gilt, will be furnished by the publisher, for fifty cents each. If the back numbers be sent, the volumes will be bound neatly in black cloth and lettered for seventy five cents each. The expense of carriage must be borne by the subscriber. NOTICE TO NEW SUBSCRIBERS.-Persons commencing their subscriptions with the Twentieth Volume (January, 1879), and who are desirous of possessing the work from its commencement, will be supplied with Volumes I. to XIX. inclusive, neatly bonnd in cloth, for $50.00, in half morocco, $78.00. NOTICE TO CLUBS.-An extra copy will be supplied gratis to every Club of Five subscribers, at $5.00 each, sent in one remittance. jan. '81, 1 v AMERICAN JOURNAL OF MATHEMATICS. PURE AND APPLIED. PUBLISHED UNDER THE AUSPICES OF THE JOHNS HOPKINS UNIVERSITY In volumes of about 384 quarto pages, comprising four numbers, issued quarterly. Second volume published the present year. Its primary object is the publication of original investigations; systematic bibliographies and brief expositions of modern methods will also be given. Editor-in-Chief, J. J. SYLVESTER; Associate Editor-in-Charge, WILLIAM E. STORY,; with the co-operation of SIMON NEWCOMB, of Washington, H. A. NEWTON, of New Haven, and H. A. ROWLAND, of Baltimore. Subscription Price, $5.00 per Volume; Single Numbers, $1.50. Address WM. E. STORY, Johns Hopkins University, Baltimore, Md. NEWAND CHEAP METHOD jan. '81, I y WOOD AND PHOTO-ENGRAVING CO. 702 CHESTNUT ST. PHILADELPHIA.PA., Send for circular. Mention this Journal. api '81 3 mo, and oct '81 3 mo. |