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74 Amoskeeg Mfg. Co., New Hampshire Spinning Mills, National Tube Co., City cf Milwaukee, Carnegie Steel Co., Amer- ican Woolen Co., United States Envelope 'Co. and the Carnegie Natural Gas Co. and has built up an unusual reputation for shipping on time. It promises to do as well as gas engine orders. IMPROVEMENTS IN FURNACE BRIDGE WALL. The accompanying illustration is an interesting photograph of the inside of a furnace of a Scotch boiler fitted with the Sturrock patent cast iron bridge walls, after the same has been in use for seven months. The photo- graph shows plainly the effect of the Tak Marine KEVIEW fect combustion and largely reducing the formation of smoke. The effect of this circulation of air is such that the bars are kept cool and will not warp, twist or burn out, and no clinker ever adheres to them. All engineers are fa- miliar with the trouble caused by clinkers adhering to brick bridge walls, which cannot be removed without pull- ing away more 'or less of the brick- work, which thus requires to be re- built several times in a season. These troubles are all eliminated by the use of the Sturrock bridge wall. The bars are so secured that they 'cannot get out of place while in use, but when necessary to make examinations or re- pairs can all be easily removed and ROTARY STEAM ENGINE. B. F. Augustine, of Buffalo, has for the past 15 years been engaged in in- venting and designing rotary steam engines. The engine herein described is the result of his experience. This engine, in design, proportions and workmanship, will furnish, under the most exacting conditions, satisfactory and reliable power. Its distinguishing features are steam-tight cylinders, per- fectly balanced pistons, great economy of steam, perfectly balanced valve rings, great economy of space, abso- lutely no vibration. It is now in ser- vice at the Lafayette hotel, Buffalo, operating fans. The engine has. but four moving INSIDE OF A FURNACE OF A SCOTCH BOILER FITTED WITH THE PATENT CAST IRON BRIDGE W ALLS fire upon the grates while the bridge wall is apparently perfectly smooth and shows no burning or other deteri- Oration due to the action of the fire. This type of bridge wall has been very largely adopted by steamship companies of Great Britain, France and Germany and other European countries and is in use in over 40 steamers on the great lakes, and is now being fitted in 'several of the new steamers for the United States Light House Board. This bridge wall is entirely of cast iron, composed of bars so arranged that air from the ash pits is admitted freely all around them( and becoming heated in its passage between the bars escapes through openings at the top of the bridge wall, mingling with the gases escaping from the fuel in the furnace, and so effecting their per- can again be replaced without requir- ing any repairs or renewals. These bridge walls have now been in practically continuous use for over four years in ocean steamers without requiring any renewals whatever, They were first introduced on the lakes in the beginning of the season of 1904 and each winter since then the number of steamers being equipped with them has steadily increased. Alexanden Hynd, of the firm of Nacey & Hynd, 209 Western Reserve building, Cleveland, is the agent for the Sturrock bridge wall on the great lakes, from whom all particulars can be obtained. A new marine ways is being con- structed at Everett, Wash., which will be managed by Charles W. Durham, an experienced ship carpenter. . parts. These parts are all perfectly balanced, so that there is absolutely no friction. It will be seen that this engine has a perfectly balanced valve. The valve is composed of two annu- lar rings, which remain stationary in the inner surface of the heads of the cylinder. These rings have parts which are direct from the steam chest. These rings, by placing one in each head, with adjustments back of them, create a perfect balance on the core. The revolving core has disks on each end with ports so that, as the core re- volves, the ports in the disc come in contact with those in the valve ring, and steam is admitted to the cylinder, and, as they pass it, is cut off and expands until the next port comes in contact. The rotary piston carrier and core arranged in the cylinder and keyed