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XII. September 16, i8&9. mON AND METAL WORK. RECOKD ANU aUIDD. LEWINSON & JUST, Consulting Engineers and Contractors. SPECIALTIES: Iron Work for Buildings, Foundations. Expert Reports, Examination of Structures. Téléphone, llS0-3Sth. 128 West 42d Street, New York. BRONZE CHEAPER THAN WOOD! Cftonot Im mArr*i «r brokvB. NKllDei IO POL.I eleKant. Oet Ont Pricea on CKitinga aud lllpeciiil Work. Send Postal Caid, or 'Pbone. Manhanan Brsss Co. 338 East 28th street. JACKSON ARCHITECTURAL IRON WORKS, J'oundries aud ShopB, East 2Bth and 29th Streets; Oface, 316 East asth Street. All Kinds of Iron, Bronze and Brass Work for Buildings, Improved Stable Fittings and Fixtures. Wa wlll be pleased to fnrniah Estlmatea of Cost or Designs. Téléphone, 2009—SSth. HECLA IRON WORKS, Forme H y... POULSON & EGER. Offi'.e, Showrooma and Works: North llth and Berry Sta., Brooklya, N. T. Iron Stairs, Elevator Enclosurcs and Cars, Railings, etc. Bower-Barff and Electro-PlaCe Finishes. . Architectural and Ornamental Iron and Bronze Work. The Prince & Kinkel Iron Works, Téléphone. i324-38th. 553, 555 & 557 West 33d Street. CONSTRUCTION AND ORNAMENTAL DEPARTMENTS. STEEL BEAMS.—All Sizes Carried in Stock. jno. Williams. J. Mitchell, Jaa. "Willianis. Architectural, Ornamental, ËcJesiastIcal B. Stiilman, Associate. Wrought Iron Dept, JNO. WILLIAMS, Bronze, Brass andWrought Iron, Foundry and Works, 544 tO 556 West 27th St., N.Y. Tel. 212-18th St. LEVERINQ & GARRIGUES, ARCHITECTURAL IRON WORK. 552 & 554 West 23d Street, New York. POST & HcCORD, Main Office and Works; StCCl attd IrOH ConstrUCtïOIl, Paidge Ave., Dupont and Setauket Streets, C Brooklyn. Buildings, Roofs and Bridges. JOHN JORDIS, Architectural and 430 & 432 East IlOth st., New York. Omameiital Ifûî! Work Stairs and Elevator EnHosures a Specialty. fOr DUllQlII^S. Record & Guide Press. FINE BOOK, JOB AND COMMERCIAL PRINTING. 227 WILLIAM STREET. Portable and Brick f iSt Pumaces that wlll give Heat ani. savo Coal. Estimâtes given. IRA G. LANE, 307 E. «4tb 5t., New Yorlc. HARLEM IRON WORKS, IroQ Work of All Kinds for BuildinES, Fire-P.scapes, Raïlïngs, Awnings, etc. OSCAR Q, BQRKÇTRQM, 403 E. lOSth St., h, Y. Smokeless Pires.—The Berlin correspond¬ ent of the ■■Times" has given some partie¬ ulars of a new invention by one Cari Weg¬ ener, which has for its object the élimina¬ tion of smolie from a furnace, accom¬ panied by a notable saving in the con¬ sumption of coal. This invention, we are told, is shortly to be brought hefore the British public in the form of the usual limited company. The success of the Sys¬ tem dépends upon feeding the furnace with powdered coal, instead of the "well- screeneà" lumps which hâve hitherto been regarded as the most advantageous form of such fuel. The coal-dust is fed into the flre from a container in front by means of a tube, which terminâtes in a revolving sieve. This sieve is kept in motion by the draught, and has the effect of scattering the fuel over the furnace in such a way that it is at once inflamed without smoke and with very little ash, Coal of compar¬ atively low Quality can be economically used in this powdered form, and the only drawback to the process seems to be the necessity for using a separate machine for the grinding of the coal to powder. On the other hand, the slack or dust which forms a necessary by-product of the coal industry will flnd hère a field for employ¬ ment which will be much appreciated by owners of mines and merchants gener¬ ally.—Chamber's Journal. VjSs for Liquid Air.—By means of liquid air the effect of température upon metals can be studied with ease, and it is seen that température has a great deal to do with ductility, tenacity and hardness. When subjected to very low températures the colors of many substances change, and some of the most brilliantiy colored salts become nearly white when brought to the température of —191 degrees C. Ag-ain, it has become possible to test the theory of the electrical conductivity of metais at very low températures, and to verify the laws which, hefore, were largeiy based upon theoretical considération': and tests between comparatively high limits. All thèse, however, are laboratofy exp ri- ments. But would not any one of them iustify the thought and work which hâve been devoted to the production of liquid air? In the line of the practical applica¬ tion of liquid air little has been done, but the possibilities seem great. When drawn trom the machine the liquid is composed of a mechanical mixture of oxygen and ni- trogen in the proportions of about 1 to 5, As the hoiling point of the oxygen is slightly higher than of nitrogen, the latter évaporâtes first, and after a few hours exposure the remaining liquid contains about 75 per oent. of oxygen. There seems to be no reason why this liquid should not be expanded into cylinders, and then uï=ed for the oxy-hydrogen light and other com¬ mercial purposes, where it would compare very favorably in purity with gas now prepared by chemical action. As a ré¬ frigérant the liquid wil! probably hâve a wide field, lhe apparatus for its prépara¬ tion being very simple and reciuiring little attention. îts use as a means of trans- ferring energy has been from the first one of the problems to be worked out, and while nothing deflnite has been determined in this line, yet it is believed by persons who are as capable of giving a judgment as any that the day is not far off when smali motors such as are now used for driving street cars and light machinery will be run by the boiling of liquid air.— American Machinist. ' Tensile Tests at High Températures.— Some interesting experiments hâve been made at the Royal Technical Instltute at Charlottenberg on the effect of heat on the physical properties of certain metals. The materials tested included iron, open-