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18 The deck beams are 6-in., 8-lb. channels covered with 3/16-in. plates, lap riveted and caulked. Over the deck plates is placed a wooden deck 4 in. thick. The shell plating is %4 in. thick on the bottom and bilges and 3/16 in. thick on ~ the upper side strake. A wearing strip of 4 by 8 in. fir is placed along the sides just above the turn of the bilge. The upper guard is rather novel in con- struction. As is shown in the cross sec- tion, 3/16-in. plates are bent to form a fiat A and riveted to the sides of the barge, the cavity behind the plates being filled with concrete. This forms a smooth, solid guard which the guard of the tow boat cannot break off. The construction of the barge is very simple. It is sectional throughout. There is no sheer between the two extreme athwartship bulkheads. The rivet holes for the deck, side, and bottom plates are all punched on the spacing table. Two hand bilge pumps pumping from each compartment are provided. Wooden_ posts, 6 in. square, will be set around the deck to take the chafing of the tug. Cleats for mooring tow lines will be bolted to the framing. The construction throughout is as light as is consistent with strength. The barges are not built to go in rough water or to withstand careless handling. If they were beached, even on a soft bot- tom, the thin plating would probably be injured. They are, however, admirably adapted to the service for which they are intended and have unusual carrying cap- acity for their size. NEW TWIN SCREW FERRY STEAMERS FOR CAL- CUTTA. John I. Thornycroft & Co. early in December, shipped from their Woolston Works at Southampton, four twin screw ferry steamers for the Port 'Commissioners of Calcutta for their passenger service. About three years ago_ Messrs. Thornycroft delivered seven ferry steamers to the Port Commissioners for a new 'passenger service which they were inaugurating. These boats have proved so successful that Messrs. Thornycroft were given a further or- der for the four boats which are now being shipped. They have' been erected at 'Woolston Works, properly marked for re-erection, and are being sent out by the Peninsular & Orien- tal 00,6828. Péra, The following are the leading par- ticulars of these boats: benpth. overs. 2. ee es '.0" foes oe Es ee ieee Breadth moulded ee re es 20'-0" Depth = modlded -..,005 0. 2: 107-0" oo, (ieddedy oe 5/-0" WEE er es eee Tet OR, eis; o: asia ee 500 pe ook THE MaRINE REVIEW Ww Oo - yl = 5G round AA -/ Double lz. ket Plate forChock Pog -- a x ee ee BR 5x G-/ 272 /4- /6 /6 20 22 CF 26 28 Longitudinal Section Through € Truss, Two Wing Trusses Similar /0 i See January, 1910 See ey a he nS = cet a ! a te is Ae stipe oh eRe eke ID 2 ese ee My | eal es a Wh , me fs ee Re A ee le omg FSAAN||SUCAL | --_-- | a i i a hole oO? Deck Plan PorTLAND, ORE. BUILT BY THE WILLAMETTE IRON & STEEL WorKS, LONGITUDINAL SECTION OF STEEL BARGES FOR THE COLUMBIA CONTRACT Co,