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

MARINE REVIEW. Floating Dry Dock for Cleveland. Officials of the:Globe Iron Works Co., Cleveland, have for some time past been considering the advisability of constructing a floating or pontoon dry dock, to be operated in connection with their ship yard in the old river bed. The plans, which are partly shown by the accompanying engravings, have been quite thoroughly discussed, and it is now announced that prep- ofofofolo ojo jo jo[T OX x SECTIONAL PLAN OF PONTOON DRY DOCK. arations forthe purchase of material are being made and that the structure _ will be built as rapidly as possible. The building of this dock by the Globe company is doubted prompted by the action of. the Ship Cones Dry - Dock Co. in putting in a plant for the repair of steel vessels, and t eee venting ship builders from engaging in repair work at their docks. i sa stationary dock at the ship yard of the Globe company ts impracticable on se Power correspondingly increased. Principal dimension of are as follows: _ Length over all, 496 feet; ecieetie breadit ee eure ie es See at top, 6 tert thickness Of side caisson at bottom, 6 ; ae a oe oe at bottom, 58 feet; space between caissons at ree as ; length of each pontoon, 30 feet; space bétween pontoons, 1 oot; height of pontoons at center, 6 feet; distance from top of pontoons to top of side walls, 16 feet; lifting capacity of each pontoon, 200 net tons; lifting capacity of all sixteen pontoons, 3,200 net tons, The draft required for docking a vessel will be about 18 feet, provided the draft of vessel aft does not exceed 8 feet. 'Such a draft can readily be secured in modern lake vessels by trimming them by the head, thus bring- ing them more on an even keel. This can 'be easily done by filling the forward compartment or forward trimming tank. Ifa-draft of more than 18 feet is required for the dock, it can be secured, of course, by dredging the channel or slip in which it is stationed. The sixteen pontoons forming the floor of the dock are to be alike in construction. They will be built up of twenty and filteen-pound plates, connected together with angles and stiffened in the middle by diaphragm of twenty pounds per square foot, which will divide each pontoon into two water-tight compartments. Ad- ditional stiffeners in the way of channel cross beams will be applied to both top and bottom of each pontoon at distances of 8 feet. Screw couplings will be used to connect the side walls with the pontoons. Piping for each pontoon will be made in duplicate, the various regulating valves being grouped together on one pontoon and operated by compressed air. Pro- vision will be made in the piping and valves, so that the dock may be ex- tended if required. Arrangements will also be made for indicating the list of the dock in any direction. Archways or doors will be cut in the caissons, so as to facilitate the transfer of material to and from dock, and a portable foot bridge will also be provided to permit of passage from one pontoon to another when the dock is submerged. 'Pumps will.be so ar- ranged that they may be operated either from the dock or ashore. Two admission pipes about 9 inches in diameter will be fitted for filling each pontoon, and fitted with double valves, so that in case of one being dis- placed the other can always be used for closing the filling pipe. The prin- cipal suction pipe for éach pontoon will 'be about 14 inches in diameter, to which on one side will be connected two pump suctions and on the other the various subsidiary suction pipes belonging to each pontoon, valves be- _ing placed at the junction of these latter, so that when desired the water can be emptied from either one of the two compartments of each pontoon -without affecting the other. In case itis found necessary, suction and fill- ing pipes can be fitted to caissons. Blocks or cradles will be fitted about 6 feet apart, both forward and aft, and they will be so arranged that they can readily 'be adjusted to the form or shape of the vessel's hull. About --three winches. or-capstans-and other- necessary bitts, cleats, etc., will be fitted for docking purposes and for the handling of material. Adjustable shores will be provided and so arranged as to prevent any possibility of a vessel shifting its position on the blocks or cradles. Moulded dimensions ~ of each pontoon will be 70 by 30 by 6 feet, and the weight of each will be 113 tons." The total weight of the dock with machinery, etc., will be 2,420 net tons, and its total displacement at 5 feet 5 inches draft will be 5,260 tons. If by calculations involved in plans for this dock it has been found that 18 feet of water will be sufficient to dock boats that may be brought down by trimming to 8 feet draft, it would seem that the operation would be comparatively easy in 22 feet of water, the depth which it is proposed to secure for the dock by dredging. 'As indicated by statements of Howden hot draft equipments, published elsewhere in this issue, the Dry Dock Engine Works of Detroit is meeting - with wonderful success in the application of this specialty to lake vessels, new contracts being announced each week. The latest order is from the Bertram Engine Works of Toronto, that company having just secured a contract for a large steel passenger steamer for the Toronto-Charlotte route. 'Particulars of the vessel are not as yet at hand, but she will un- doubtedly be modern in every way and high-powered, as the hot draft equipment is to be suited to about 2,500 horse power. In his annual re- SIDE ELEVATION 1s siding Is,.it is account of the river frontage required for the ee oi ney ae Haner proposed to dredge a slip about 500 feet long and fat ee the pontoon dock. end of the yard, parallel to the river, in which to statio i "1 dino ber 'no maintained, as the This would still permit of three building yeahs seoree Tete eee third frontage on the slip provic It is esti- and Tahoe cout es one in and out of the river as Goel e Peat mated that a floating dock of the kind pggposed are appliances com- $100,000, and that the cost of the slip, dock and all o plete will not exceed $150,000. The lower portion of the do toons, which can each be sepia eet Paired or painted, one by one, entire! , ome ends Bees ciieuts are made by which, a necessary at s the dock can be lengthened by adding acct sixteen independent pon- m the rest of the structure and re- ther. At the dependent of each future date, ck will consist of itional pontoons and the lifting LAN on GLOBE COMPANY'S PROJECT FOR PONTOON DOCK. port, the engineer-in-chief of the navy, Commodore Geo. W. Melville, refers to this draft on the fast torpedo boat Wheeling, particulars of the trials of which are published elsewhere in this issue. "The performance of the Wheeling," says Commodore Melville, "is remarkable, and it may be attributed in a great measure to the Howden system of hot draft, with its attendant economy in production of steam." ; The 'Review is indebted to A. J. Maclean, professor of naval architect- ure at Webb's Academy, for a copy of a neat pamphlet descriptive of the academy at Fordham Heights, New York city, and containing also re- 'quirements for admission, courses of instruction, etc. Several half-tone engravings illustrating the academy and surrounding grounds, as well as drawing room, mould loft, lecture room, students' quarters, etc., are espe- cially interesting.