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 of 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 co tributions hereafter will form the most prominent feature, but articles selected and condensed from the English, French, German and Austrían engineering periodicals 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 tock 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, $75.00. NOTICE TO CLUBS.-An extra copy will be supplied gratis to every Club of Five ubscribers, at $5.00 each, sent in one remittance. jan. '81, 1 y 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 NEW OMB, of Washington, H. A. NEWTON, of New Haven, and H. A. ROWLAND, f Baltimore. Subscriptio: 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. apl '81 3 mo. and oct '81 3 mo. ESTABLISHED 1820. YOUNG & SONS, 43 North Seventh Street, Philadelphia, ASTRONOMICAL AND ENGINEERING INSTRUMENT MAKERS Young & Sons possess the only line of Graduating Engines in America capable of the finer graduations. Engineers and others invited to call. PATENT TRANSITS, PATENT LEVELS, PATENT SOLAR TRANSITS. may '81 ly Manuals and Catalogues on application. C. HENRY RONEY ENGINEER AND ARCHITECT FRANKLIN INSTITUTE BUILDING, 15 and 17 S. 7th St., Phila., Pa. Designs and Estimates for Buildings, Railways, etc. Surveys Made, Mineral Lands Examined and Professional Information Given. Feb 81 ly THE J. MORTON POOLE CO., WILMINGTON, DELAWARE, MANUFACTURERS OF Patent Ground Chilled Rolls. GRINDING MACHINERY, Adapted to the wants of Rolling Mills, Calendering Works, Paper Mills, etc., or for Feb. '81, ly LIGHT SOLAR TRANSIT. TROY, N. Y. Special Purposes. ESTABLISHED 1845. W. & L. E. GURLEY TROY, N. Y. MANUFACTURERS OF GIVIL ENGINEERS' -AND SURVEYORS' INSTRUMENTS. Full illustrated Price List, with description of latest improvements, sent on application. mar '8 ly The James Smith Woolen Machinery Co. Works, 411 to 421 Race St., Philadelphia, Pa. WOOLEN MACHINERY, INCLUDING MACH NERY FOR THE PREPARATION OF WOOL. ALSO CARD CLOTHING OF EVERY DESCRIPTION. June, '81, 1 year. Send for Illustrated Circulars. J. L. SMITH, MAP PUBLISHER. LARGEST ASSORTMENT OF Maps, Atlases, Globes, Spring Map Rollers, Map Cases, ALL KINDS OF Drawing Papers, Linen, etc. No. 27 S. 6th St., Phila., Pa. July '81 6m W. C. ALLISON & CO. THIRTY-SECOND AND WALNUT STREETS, PHILAD'A, MANUFACTURERS OF ALL KINDS OF WROUGHT AND CAST IRON WORK -FOR CARS, BUILDINGS AND BRIDGES. Every description of Railroad Cars, Bolts, Nuts and Washers. Also Manufacture, from the Best Quality of Iron, Gas, Steam and Water Pipes, Tubing for Oil, Salt and Artesian Wells. Cast, Wrought and Malleable Iron Fittings. IRON AND STEEL LAP-WELDED BOILER TUBES. LOCOMOTIVE BOILER TUBES A SPECIALTY. apl, '81.-1 y. Moc Kean, Newhall & Borie Philadelphia (Lovering) Sugai Refinery 225 Church Street a Superintending Desire to engage Chemist of the best ability, to whom literal engagement would be offered. a Sept 81-tf Hall of the FRANKLIN INSTITUTE. PHILADELPHIA, July 13th, 1881. Notice is hereby given that the Franklin Institute of the State of Pennsylvania has under consideration, in accordance with the recommendation of its Committee on Science and the Arts, the conferring of the ELLIOT CRESSON GOLD MEDAL on WILLIAM WOODNUTT GRISCOM, for his Electric Motor. Any objection to the proposed award can be communicated to the Actuary of the Institute within three months of the date of this notice. aug 3t D. S. HOLMAN, Actuary. WANTED. The following numbers of the JOURNAL OF THE FRANKLIN INSTITUTE. · A liberal price will be paid for any of them, viz.: |