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28 \ a connection on the lower part of the front head of the steam drum, this connection being provided with internal feed-distributing pipes ex- tending the whole length of the boiler opposite the two outer rows of tubes. These pipes are provided with open- ings opposite each of these tubes, causing the jets of feed water to be projected down through the outer tubes, and, as these feed pipes are below the water level of the boiler, they act as siphons, causing large vol- umes of water to be drawn through these tubes, forming an economizer or feed water heater of the two outer rows of tubes. This arrangement also forms a system of forced circulation, thus causing the boiler to be thor- oughly reliable even when forced to a rate of evaporation of more tnan 18 pounds of water per square foot of heating surface. In the other types shown. is a Mosher boiler arranged for burning oil fuel, under the Shutte & Koerting system, as adopted by the British admiralty. _fire-clay cylinders in connection with the oil burners and proper dampers for the control of the air supply. The boiler adapted for large vessels, such as battleships. colliers, transports, etc., -is provided with a superheater, so arranged that it may be flooded and made a patt of. the boiler, under which conditions saturated steam will be furnished. To furnish: swperheated steam it is necessary to ciose the small valve above referred to and close the large steam valve when the steam generated by the boiler will pass from the dry pipe up into the lower pipe, thence down into the up- per drum of the superheater, which is fitted witha diaphragm plate, causing steam to pass down through two inner rows of tubes into the lower drum of the superheater, then up through the two outer rows of tubes into the upper pipe, from where it passes into the main steam connec- tion, An arrangement of fire tiles baffles causes the gases of combustion to pass in contact with all the boiler tubes before they reach the superheat- er on the way to the stacx. In order still further to facilitate the renewal of tubes without disturb- ing any other part of the boiler, the proportions of the parts are so arranged that no removal of any part of the casing is necessary for the removal of the tube. As will be seen by an examination of the illustrations, the operation of the removal of a tube is effected by taking off the hand- This includes the *use of Tre MarRINE REVIEW hole cover and passing the tube up as far as necessary tnto the space between the steam drum and the cas- ing, this bringing the lower end of the tube entirely within the steam drum and free of the tube sheet, after which the tube may be passed down and forward into the steam drum and taken out through the front man- hole. This operation is clearly shown both in the front and side views of the Mosher boiler, the front view showing how the tube clears the tube sheet of the steam drum when the upper portion. is drawn up into the casing, .while the side 'view shows also how the tube is brought into the drum for removal through the manhole. The Mosher Water-Tube boiler Co, offices are at 30 Church street, New Vork city. A NEW TYPE OF STERN FRAME. A new type of stern frame has just recently. been built from the designs of Arthur A. Fownes, the managing di- rector of the Fownes Forge & Engi- neering Co., Ltd., of South Shields, England, to whom we are indebted for photographs and drawings from which our illustrations are reproduced. The > { EA Secrion WOILITS F4VNOS SECTION OF . PORTABLE GUOGEON. FOWNES PATENT BUILT STERN FRAME WITH CIRCULAR BACK POST AND PORTABLE GUDGEONS KEYED. AND SHRUNK ON. peculiarity of the design lies in the fact that the stern frame is built to- gether, and is without a weld through- out. The frame is forged in three sep- arate pieces, namely, the back post, the 'boss piece, and the bottom piece. There is a scarf joint below the boss at the archway instead of the ordinary weld, while the back post is turned FOWNES' DESIGN OF STERN FRAME,