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at 2 iy, 2 hi, tervals of about 13 ft. 170 obtained from experiments carried out © in one of the ordinary vessels of the Rederiaktiebolaget Lulea-Ofoten.. As a result, the hoppers are raised some distance from the tank top, and they have been constructed in a sub- stantial manner with bases sloping 42 de- grees to the horizontal, and the ore travels to a series of four chutes, each of which is manipulated from the dis- charging holds.. The door of each of these chutes is fitted with a lever, about 7 ft in' length, and 'the door moves with a_ parallel motion | eccentrically, thus relieving the pressure of the ore on the door, and permitting the door to be easily opened by one man. Upon the skip attached to the crane rope being lowered into position, the attendant is. enabled, by operating the door lever, to arrange for the requisite amount of ore to travel into it. Thereupon the door having been dropped, the bucket is drawn to the top, the craneman having had the whole of the operations under his observation. The arrangement of chute doors may be seen in Fig. 4. The hatchways, 2 ft. 6 in. high above deck level, are formed of continuous longi- tudinal girders divided by athwart ship plates, and they were designed to suit the loading arrangements at Narvik, where the dock spouts, are placed at in- These hatch- ways being of somewhat unusual di- mensions, ,special provision was made for securing the covers by means of a number of wooden beams, as shown in Fig. 5. Having been specially designed for the ore trade, the Vollrath Tham must necessarily go one way in light trim, and has, therefore, in addition to the double bottom, been fitted with wing tanks, similar to those commonly used on the Great Lakes, giving her a total water ballast capacity of about 3,000 tons. As these wing tanks are required to support a considerable part of the ore, they have been built of very sub- stantial scantlings and divided at inter- vals of about 12 ft. by complete or partial bulkheads. To maintain water- tightness against falling ore, the tanks have been sheathed with 5%%4-in. pine covered with 3-in. steel plate in way of the hoppers, and, as the tanks are continuous, they add considerable longi- tudinal strength--a matter of consider- able importance in an. ore vessel owing to the irregular distribution of the loads. The generating plant and switchboard for power and lighting and operating the cranes are fitted in. a separate ma- chinery room at the after end of the vessel immediately aft of the main en- gines. There are two duplicate generat- ing sets, each consisting of a compound enclosed type engine with forced lubri- cation, running at 400 R. P. M,, and coupled direct to a Siemens compound TAE Marine REVIEW IGIIO. pz Crew Space Ore Hopper Nol 15323 UF. Ore Hopper No.2 32456 C.F | Ore Hopper No.2 32456 C.F. J Ore Hopper No.4 16228 C.F. Ore Hopper No5 16228 C.F. | Ore Hopper No.6 22456 CLF, I Ore Hopper No.7 16228 C.F, Tons' - 7 Electrical Machinery Dz: Ac ° MARINE REVIEW Fic. 2--INBoARD PROFILE AND DECK PLANS OF ORE CARRYING STEAMER VOLLRATH THAM.