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

Isherwood System of Construction' Dealing With the Arrangement of Plates and Anal Forming the Spar Deck HE accompanying plan with this . article, printed on. page 148, shows the arrangement of plates and angles forming the spar deck. Shown on the port side are the 'stringer plates, stringer angles, butts of sheer strake plating, deck plating, hatch coamings, masts, forecastle and after house foundations. The dotted lines lengthwise are the deck longitudinals and the cross lines, the transverses. Starboard Side Plating The starboard side plating is re- moved which shows the transverses and longitudinals to better advantage. The longitudinals are numbered from the center line, the angle on the center being No. 1; this? longitudinal runs from the 'stem to the foreside of "NG 41 hatch, between after end of No. 1 to the foreside of 2, after- side of 2 to foreside of 3, afterside of 3 to foreside of 4, afterside of 4 to bulkhead No. 20, and from the _ afterside of boiler opening to transom frame. No. 2 longittidinal is practically the sanie as No. 1 with the exception of ending on the shell forward making it a little shorter. The longitudinals 1, 2, 3, 4 and 5 are the same length between transverses 7 and 20, 3, 4 and' 5 are shorter at the ends. Longitud- inals 6 and 7 run from 1 and 3 to the important, transom and are very -- which will be shown later on. - No. 6 longitudinal is double in way of the deck plating between the hatches and forms a butt strap for connecting the deck plate to the stringer plate. The transverses Nos. 1, 3, 4, 5, 7, 9, 11,43, .15, 17:19, 22, 20; 28 ands! are numbered on the starboard side. Nos. 2, 20, 21, 24 and 30 are bulkheads. The forecastle bulkhead is fitted on transverse No.. 4. The after deck house runs between bulkhead 20 and 31, leaving 4 ft. of a passageway at the ship's side. The outer strake of plating con- This is the eighth of a series of articles on the Isherwood system of construction which began in the September issue of the Marine Review. The first article dealt with the gen- eral specifications of the steamer; the second with the sheer, half-breadth and body plans; the third explains the method of getting the sheer; the fourth dealt with the longitudinal and transverse framing; the fifth with offsets; the sixth with the shell plating and the seventh with the shell plating expansion. 'side of the deck, nected. to the 'outside plating is the stringer plate and is made up with nine plates on each side. Plates 3, 4 and 5 are 221.2 lb. per square foot and the balance are reduced in thick- ness. to 15. db; : Stringer angle is 4 in. x 4 in. x 9.8 lb. and connects the sheer strake and. making same water- stringer plate, tight. The stringer. angle is cut clear of the scuppers and reinforced below, 'so that 'when finished represents a con- tinuous angle all around the. vessel. The scuppers are marked With a cir- ele at Sy The sheer strake pure are marked K1 to 11 and should not be nearer the -scuppers and stringer butts than 4 ft. -Deck* Plating There are five strakes of © deck plating on the vessel. A is the center strake and outside On calking, made up with eight plates, lapped and riv- eted on the edges to No. 2 longitud-. 1 longitudinal coming on. inals, No. the center of the plate. With the ex- ception of plates Nos. 1, 2 and 6, which are Ag tb. per sa. tt, the strake is 10 ib. per. sq. ft. Plate No. 1 forms the : windlass foundation and Nos. 2 and 6 mast foundations. B strake has eight plates on each all of which are 10 Ib. 'pet sq. it. ("Both the seams of. strake are lapped on longitudinals 2 and 4 and riveted to it, the lap farth- est from the center being outside or calking edge. ; C strake has seven plates on each side, which are all 10 lb. per sq. ft. The inner seam is lapped on longitud- inal No. 4 and under the seam of B strake and the outer edge is butted edge to edge with the stringer plate. The angle riveted to No. 6 longitud- inal forming the butt strap. Hatch coamings are composed of 9-in. and 21.8-lb. bulb angles and form a ledge for the hatch covers and keep the hatch openings watertight at the deck. Forecastle bulkhead angles are composed of 4-in. x 3-in. x 8.5-lb. angles. The deck house aft has angles to the deck forming coamings the same as forecastle. Watertightness of the deck is very important and every effort 'interests the By Robert Curr should be made to have it so for the safety of the ship, crew and cargo de- pends upon it. Port Arthur Ship Yard Busy The Western Ship Building & Dry Dock Co.,. Port Arthur, Oat, arc 4. present employing about 900 men. » About 60 per cent of the steel work _ of the new passenger steamer build- ing for the Northern Navigation Co., of Collingwood, Ont., is completed. This vessel is building under Lloyds survey. An ice tug for the Whalen is 85. per cent completed. This tug is heavier than the Whalen. The shell plating is 34 in. thick. and framing is. heavy and closely spaced. . The floor is. deep with heavy © double channel keelson . on top. 'and side stringers, three on each side. The deck and houses are of steel, heavier than usual. She will have a triple-. expansion engine 18, 30 and 48-in. cyl- inder diameter by 30-in. stroke, and a Scotch: boiler 15.2, 4 in. by TY ft. 5 in., allowed, 180 lb. steam pressure.- The company is also building a small- er tug for the Whalen interests to be - 85 ft. over all, 75 ft. between per- pendiculars, 19 ft. beam and Ee: deep. The plating is. 17. a Ib. "per square foot and the 'other materials in proportion. : an - Apparently package freighters are going to be in good demand, the Anchor Line having chartered . the Minnetonka from the Chicago & Du- luth Transportation Co. The Minne- tonka was formerly the Alva of-the Bradley fleet. As exhibiting the trend uptown even among vessel owners, M. A. Hanna & Co., Hutchinson & Co., W. C. Richardson & Co., and the North- ern Lakes Steamship Co. have moved from the Perry-Payne and Rocke- feller buildings to the Leader-News building, Cleveland. The Berwind Coal Co. will erect its fourth coal dock at West Duluth during the coming summer on prop- erty recently purchased east of the Grassy Point tracks of the Northern Pacific railroad.