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

8 | MARINE improvem ents in the Construction of Lake Vessels. By John Haas Engineer and Nayal Architect, Philadelphia. Having been engaged during the season of 1896, in super- vising the construction of some of the Bessemer Steamship Co.'s ves- sels, and having at the same time many opportunities to observe the construction of other lake vessels, it appeared to me that there were two points in their general construction that were susceptible of improvement, both resulting from the very wide hatches ey L 45 ' ily . P alle L ae) + : 3) "f -- i al" Ne 3 gv Ge cee pla ae * ' \ | "A 4 Buaw Sz ma 4 * REVIEW. ee, --_-- of a section of the steamer Sir Henry Bessemer shown in Fig. 1, and give the following results: Full area of section...-.------ oe Effective area (for hogging strains). . - Neutral axis above base line ......-- Neutral axis below top member ..... 18.64 feet Moment of inertia of section .......- 184,089 foot inches - - 14 feet draft: Displacement (estimated)....... 6300 tons Bending moment (estimated). . . .64890 foot tons 1633.4 square inches 1580.7 square inches _ 9.86 feet ; : iy Shurstrake Sox Ve> Hh | id ryt | Drvklang HE « ; ra ee Uf," ees los ---- Beswre SS". I Ug "Y, Sash eee | memes femmes eens weet F's lhe Aa /y,. We oe as \ Se s . jg 5, ' air » BO Cebit 5 eunkison Lihue: FIG; ff MIDSHIP SECTION OF LAKE FREIGHT STEAMER SIR HENRY BESSEMER. Slt wc iw! é '| alt pe 'Length on keel, 412 feet; beam, molded, 48 feet; depth, molded, 28 feet. to Handle fhe cargo baci which cut : away the greater part of the deck, thereby also rendering the connection between the two sides insufficient to properly resist the very complex strains, to which ves- sels laboring in a heavy sea are so frequently Subjected. It is well known that some vessels have succumbed to these. strains, and even the stronger class of vessels show considerable vibration at times. It may therefore be interesting to find how much strain the material is really undergoing, and how much this would be increased when a greater depth of channel will permit lake vessels to be loaded to 18 For this purpose I have calculated the moment of inertia feet draft. 64,890 x 18.64 i : Ge square inch Strain, top: 184,089 6.57 tons per sq 64,890 x 9.86 ee pein OS WS Tee square Ice. Strain, bottom: 184,089 3.48 tons per sq 18 feet draft: Displacement (estimated) ... 8400 tons Bending moment (estimated) 82400 foot tons 82,400 x 18.64 Se ASLOS9 i, 82,400 < 9.86 184,089 Strain, top: --8.34 tons per square inch Strain, bottom: --4.414 tons per square in.