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: : : : Ee : February, 1910 TAE MarRINE REVIEW HvaLen, Futt SPEED SUBMERGED. CoURSE PERFECTLY HoriIzoNTAL. The little map gives a graphic idea of the nature of the journey, Since her delivery to the Swedish government, she has been put through further trials. One of these constituted a two-hour, full-speed submerged run, and during that time she described circles, made turns and figure-eights, yet at no time did her depth. vary more than 10 centimetres (about 4 inches). The photographs of the Hvalen running submerged show that she is able to keep an even keel; and in diving from the surface ther change of trim does not exceed a maximum of three degrees at any time. It shows that boats of this sort--even of goodly length--can operate safely in moderate depths of water, and should the diving- steersman 'be inattentive there is no danger, even at high speeds, of the Laurenti boats plunging to a danger- ous depth. The Swedish government has been so pleased with the Hvalen that three more submersibles have been ordered from the Fiat-San Gior- gio of Spezia, The Dykkeren, built for the Danish government, is an all-electrical sub- mersible, and is designed to meet special local conditions. Her batteries are charged from either another ship or a shore station. She. has a stb- merged displacement of only 130 tons --about the same as that of our own submarines of the Adder class. By the contract, she was required to make 11 knots on the surface and 7 knots submerged; but ther builders obtained 12.02 knots light and 81 knot under water. Since the Dykkeren's delivery, she has been used continually in train- ing crews, and the following account by a naval officer will give some idea SWEDISH SUBMERSIBLE HvaLeN At Fut Speen, 15.2 Kwors. Hvaten, Diving ANGLE Apout 2% DEGREES, of how well the little craft can be handled and show, too, her possible usefulness in attacking an anchored armorclad. "The 'Olfert Fischer' was lying- up in the sound guarded by three torpedo boats. The day was clear with a fresh easterly wind breaking the water's surface. The submarine was expected and everyone on deck was alert. Not- withstanding this careful watch and the frequent use of field glasses, the Dykkeren was able to get unobserved within 300 metres of the ship and directly on her starboard broadside. It was not until the Dykkeren came to the surface and blew her whistle that anyone on the four watching vessels knew that she was anywhere near. For the greater part of her approach the Dykkeren kept her periscope under water, and brought it to the surface only once in a while to check her course. After this run, the Dykkeren made excellent torpedo practice at