[5] U. S. FISH COMMISSION STEAMER ALBATROSS. 7 



REVERSE BARS. 



The reverse bars are of angle-iron, 3 by 3 by 3^6" inches, one on every 

 frame extending to the stringer plate and 12 inches above the upper turn 

 of the bilge alternately. There are double reverse bars on all frames 

 under the engines and boilers, and also on the line of all keelsons, hold 

 stringers, and bulkheads. Joints are covered with angle-iron butt- 

 straps, not less than 18 inches in length, with three rivets in each end. 



KEELSONS. 



On top of the reverse bars there is a center keelson, 12 by 4^ inches, 

 beam iron, | inch thick for three-fifths the length amidships, and f 

 inch thick forward and aft. On each side, 8 feet 8 inches from the center 

 line, there is a keelson of t\^o channel bars, 7^ by 2J by -^ inches, riv- 

 eted back to back ; and at the bilge on each side a keelson of two angle- 

 irons, G by 3^ by-i^ inches, riveted back to back. The bilge keelsons con- 

 form to the shape of the floors, and the side keelsons run parallel to the 

 center line. There is also a cross keelson for the shaft stuffing-boxes. 



At a distance of 4 feet 7 inches from the center line on each side there 

 runs a keelson of beam iron, 8 by 4i by -| inches, riveted to the reverse 

 bars. 



INTERCOSTAL KEELSONS. 



Of these there is one of -j% inch plate run on the center line, and one 

 of -j^e inch plate under each side keelson, extending from keel to top of 

 floors, well fitted between floors, and connected with them by an angle- 

 iron 2^ by 2^ by 6--^ inches. 



DECK BEAMS. 



Additional intercostal keelsons are placed under the engines. 



For the main deck they are of T bulb-iron, on alternate frames, 

 7 by 3f by f^ iuches for three-fifths the vessel's length amidships ; for- 

 ward and aft they are by 3f by f inches, except at the cai)stan and 

 riding-bitts forward, and at hatches, where they are 8 by i^g- inches. 



STRINGERS. 



The main-deck stringers on each side are 38 inches wide by f inch in 

 thickness at midlength, reduced to 26 inches width at the end. Stringers 

 are connected with sheer-strake by angle irons, 4^ by 3^ by --^ inches, 

 securely riveted to both the deck beams and sheer-strake. At the 

 foremast and mainmast there is riveted to the deck beams a stringer 

 plate 42 inches wide and f inch thick, long enough to cover two beams 

 forward and affc of the mast, securely riveted to the deck beams 5 

 through this plate a hole for the mast is cut. Similar tie-plates, 

 covering three or four beams, are riveted in wake of bitts, windlass, 

 capstan, hoisting engine, and reeling engine. 



