Another of the class, Thornycroft’s _Tartar_, made 35.678 knots on the measured course, an almost equal speed on the six-hours’ run, while the highest speed she showed was 37.037 knots, thereby establishing a world’s record. The same year saw the launch of the _Swift_, at Birkenhead. She has a displacement of 1,800 tons, and is the largest and fastest destroyer yet constructed. She is of a special type, a class by herself; her turbine engines of 30,000 indicated h.p. give her a speed of 36 knots, and for armament she carries four 4-inch guns and two torpedo tubes. Not far behind her in dimensions and speed is the Japanese _Kaifu_, but a Russian destroyer building at the Putilov yard in Russia is to be of 1,300 tons, but with engines as powerful as those of the _Swift_, is expected to prove fully as fast, if not faster. The ocean-going destroyers, built in 1909, have displacements varying from 880 to 1,000 tons, and a speed of from 33 to 34 knots, a typical example being the _Maori_, built by Denny at Dumbarton. The new naval force for the Australian Commonwealth includes some very fine destroyers, among which may be mentioned the _Yarra_. A tendency has been manifest in some of the later destroyers to provide better all-round fighting and sea-going qualities than were possible in vessels like the _Swift_, in which speed was all-important. The _Beagle_ and _Acorn_ are considered to be good representatives of the compromise. The bunker capacity of destroyers being very limited, and their consumption of fuel large, it is evident that the scope of their operations must be considerably restricted. At no time is it possible for them to be more than fourteen days away from their coal base. In case of necessity they might coal at sea, if coal storeships accompany the fleet to which they are attached. The adoption of oil fuel, which can be stored in the double bottom, may increase the range at which these vessels can operate, and if, as is expected in the near future, destroyers driven by internal combustion engines are adopted, their range of action will prove more extensive still. [Illustration: H.M. TORPEDO BOAT DESTROYER “TARTAR.” TURBINE DRIVEN, SPEED 35 KNOTS. _Photograph supplied by Messrs. J. Thornycroft & Co., Ltd._] [Illustration: H.M. TORPEDO BOAT DESTROYER “MAORI.” _Photograph supplied by W. Denny & Brothers, Dumbarton._]