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oil fuel furnace. April, 1909 "TAE MarRINE. REVIEW Torpepo Boat Destroyer TARTAR Maxine 34.5 Kwnors. speed losses and consequently when the last contract for destroyers was handed out a speed of 33 knots was stipulated. So far four.of these vessels have been completed by various shipbuild- ers, and in each case the 33-knot (38 miles) per hour has been exceeded, but the most striking excess is that of the "Lartar:? Pins joat 16.270 it. in length on the water line by 26-ft. beam, and has a depth of 1/-ft.-2 in, with a displacement of 850 tons. The shape of the hull follows the general Thornycroft practice, 'aciuding the graceful turtle deck in place of the clumsy raised forecastle, thus throw- ing water overboard instead of under the upper deck. High tensile steel is used almost throughout, while every. care has been exercised . to secure the maximum of strength in the hull with the minimum amount of material. Steam is raised by a battery of six water-tube boilers of the Thorny- croft type, oil-fed exclusively, the fuel used being heavy oil injected into the furnace by means of special burners of Admiralty pattern. This combina- tion provides a steady and ample supply of steam, the working pres- sure being 220-lbs. per sq. in. The tubes are straight except at the ends where they enter the steam and wa- ter barrels, and the design lends it- self well to the protection of the up- per barrel from the fierce heat of the ag Each boiler has 5,300 sq. ft. of tube surface; the fire- ~ box tubes are 13% in, in diameter and 10 1. s. g. thick, and the remainder are 144 in, in diameter and 12-12 s. 4g: thick, Many advantages are derivative from the utilization of oil fuel, not the least being the freedom from smoke, as may be seen from the ac- companying illustration of the "Tar- tar,' which shows the vessel running at 3414 knots, there being scarcely a trace of smoke visible. This is attributable in -a gréat measute. to the precision with wh'ch the neces- sary amount of air can be adjusted for perfect combustion. Another im- portant consideration is the freedom Cre from the continual shower of ashes ejected from the funnels and falling upon the deck as prevailc im coat burning vessels, together with the total absence of flaming at the fun- nels. Moreover, the ease with which the speed may be reduced almost in- stantly by the adjustment of the fuel feed is a very important considera- tion. The machinery comprises Par- son's turbines. : The vessel will be fitted with wire- less telegraph apparatus, while me- chanical means are provided for vent- ilating the engine room when the hatches are closed down in bad weath- er. The usual installation of speaking tubes is superseded by a complete plant of loud speaking telephones which are fitted to all the important stations throughout the ship. The main deck is not obstructed by high combings along the boiler rooms-- __ an advantage due to the Thornycroft type of boiler--thereby providing facilities for easy passage from side to, side, In the case of the -official trials for the vessels of this class much more severe requirements were im- posed by the Admiraity. Instead of making allowances in the way of load in the full speed trials, as was former- ly the case, the vessels had to be in complete war trim with full complement of men, fuel, stores, etc, and arma- ment, which in these ve7sels consists of three 12-pounder quick firing guns --the 6-pounders being dispensed with --and two torpedo' tubes. Moreover, instead of being subjected to a one or TurBINE ROOM OF THE TARTAR. STARTING PLATFORM SHOWING ARRANGEMENT OF SteEAM VALVES AND PRESSURE GAGES.