The following text may have been generated by Optical Character Recognition, with varying degrees of accuracy. Reader beware!

4 26 pared to the beloved steam engine. A well constructed gas engine intelli- gently looked after, will do periods of running that would not be credited unless actually seen by a marine en- gineer. It is but natural that engineers who have had experience of the good work done by the steam engine, and look with suspicion upon a system which has only been fully tried on land, but the'entry of the gas engine is inevita- ble, and it is only fair to ask marine engineers not to anticipate difficulties before they arise. If science or prog- ress did not demand a trial of this form of motor, there is the economic force represented by the shipowner who, in an age of competition with low freights and badly paying ships, is compelled to look for a cheaper type of prime mover in his steamers. This he can have in the gas-engined boat, or the auxiliary sailing vessel. Apparently it is not so much a ques- tion of building as inducing owners to leave the beaten track and pay a fair price for such a vessel, but it is to be hoped that a good trial will soon be made to demonstrate all the advantages claimed for the gas en- gines; our German competitors have already commenced construction of three such boats. THe Marine REVIEW The Mosher Water-Tube Boilers providing a tubular wall, which ex. | There are few firms engaged in the manufacture of water-tube boilers with a more enviable record than that of the Mosher Water-Tube Boiler Co., of New York. The several types of boilers built by this company have demonstrated their adaptability to all kinds of marine service and the various methods of firing. The ap- plicability of the Mosher boilers may be seen and the advantages of. the design appreciated by referring to the accompanying illustrations. The general arrangement of this type of boiler is best siown In the drawing of the Mosher boiler designed: -- for torpedo boats, torpedo-boat de- stroyers and scout cruisers, in which a high forced draft is used. All the tubes are slightly curved, so that they aim towards a row of hand-holes in the upper portion of the steam drum, through which as many as 50 tubes may be withdrawn and replaced when necessary by removing a single hand-hole cover in the upper portion' of the steam drum. In the longitud- inal arrangement the tubes next to the furnace are spaced their own di- ameter apart, each tube in the first row being bent between the two ad- joining tubes of the next row, thus' tends from the fire-door end for three-quarters of the length of the furnace. For the remaining fourth of the length of the furnace the tubes are not bent between the adjoining tubes of the next row, thereby leaving an opening for the passage of the gases of combustion from the furnace among the tubes into the stack at the opposite end of the boiler, The sides and ends of the furnace at are lined with fire brick, which ig ge. cured to a steel casing. At the ends of the furnace is a second steel cas. ing, forming an air space connecting with the ash pan. The firebrick js provided with small circular openings, permitting the heated air to pass from the ash pan through the air space into the furnace above the fuel, Perforated pipes extend the entire length of the boiler, and are provided with a number of rows of holes op. posite the space between the tubes to permit jets of steam to be blown among them. Thus, any soot which may have accumulated on the tubes may be blown off simply by opening a steam valve connecting these pipes with the boiler. The feed water is delivered through oLg" --- See ue" a 13-0 $2" 24" AiR Door » cet po | | ooo ors 1 7 gain Vo By Bp Ge Re Re ae eta -- p (ro me C) Ox... b"x 42" AiR Door, Bh io4- -: Z Tr 207 ate eh a * 14 Be. ata *)0 B.W,¢. PLATE 4%," Assesros Ra Fire Brion. VTi prea PPP \ FIRE CLAY. \CYLINDERS ae _ Door Fi MOVING Fine Chay CYLINDERS BURNER REGULATING Hoe, | ' a y i2'-0" HEATING SURFACE 4ASbE so. Fr, A ae GRATE SURFACE ~ §0l So. Fr. HIGH SPEED YACHT ------ Ratio H.S. To GS. Tote --_FOoR -- - | WEIGHT WITH FITTINGS 5 EXCLUSIVE OF OL FUEL SYSTEM. _ 43,500 LBS ; , EIGHT WITH Waren. 33,600. Las, ---- RESIGNED BY ---- WORKING PRESSURE 275 LBs. a Sea GieLow _N. A, ---- hy SCALE S4" et Fy ---- "cg eee a oe -- 24 Fine Brice, / es "t/ oo C3497 O29 CO) Oe Ore Cb oe , ieee © io oe RES Se 4 " AS@eaTos -- 24° Fine Baier. 2200 Tvaes 1/4" oa. 12 BwW.6. 4-4" Fine Balch: -- MOSHER PATENT WATER TUBE BOILERS -- FOR