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April, 1909 WL 3 Ls yo L 639 Tons 671 504 TAE MarRINE REvIEW pected AD Lesa 10 o Bok Tob 16-1 saad 134 555 411 dh 411 411 411 2 Gross Tons" Total rere Capacity 723 411 415 590 616 f Curve of Buoyancy 5 Net Tons per Inch Curve of Weight 5 Tons per Inch | pane? Curve of Bendids | ~ Leo, Curve of sit Weight 5 ( any questions, if there "any point that is not clear, I would very much like to hear from you, because I re- gard this matter as the feature of this convention. J regard it as one of the most important things we have before us. You all know just as well as 1] know that there are ships on our lakes today that are exact duplicates, built on the same model, and that some of these ships are carrying from 100 to 200 tons more onthesamedraught than their. -sister ships, ~~ Now <1. think J know, from. the talk Mr. Logan has given us, why they are doing it. We are not aiming in the steamship com- pany to have any one of our ships carry a greater load seemingly on the same draught than any other ship in her class. What we are particularly in- terested in is giving the structure of our ships fair treatment and not bring- ing any unnatural strains on the ships. I am after the life of the ship. You - may go and belly these ships and in the course of the season carry 1,000 tons more than a sister ship, and then it is a case of turning her over to the _ Shipyard and letting them fasten her up at a cost of something like $20,000. I fail to see where this is very profitable business, and I would rather you would take care of, them all the time. I Capt. Cullen--If a_ boat has been ellied will she come hack? 'Logan--Sometimes. If she won't Dane by. putting her on keel blocks, is STEAMER HARVARD LOADING DIAGRAM AND URVES OF SHEARING AND BENDING MOMENTS SCALES ' Weight, Buoyancy and Load Curves 5 Tons= 1 Inch Shearing Forces 60 Tons-- 1 Inch Bending Moments 5000 Ft. Tons=-1 Inch Longitudinal Seale 1/s= 4'8" Curves Made for 193" Draft Ba. you would have to knock out the 'Tivets and re-rivet her. Capt. Cullen--When 1 sailed the Poe she was bellied down 31% in.* the first load we put into her. We light- ened up 150 tons in the hatches, and got her up half an inch. Then we lightened up 50 tons more and still had 3 in. belly, but the minute her engine was checked down she would vibrate as she had never done before, so I put her back to the 150 tons amidships and she still had 3 in. of a belly. She didn't start taking this until she got down to the 14 ft. mark. Mr. Logan--The_ probability is she has now got set and if you tried to bring her back you would loosen her up. : Capt. Bailey--Now we the boat, let's unload her. We have to distribute a lot of water in the for: ward end to unload them. -- ; Capt. Woodford--Is there any ob- jection, Mr. Logan, to Icading a boat heavy in every other hatch, that is, a 12 ft. center hatch boat? | Mr. Logan--No, sir. -- . Capt. Olson--Suppose you are load- ing coal in one of the 440 ft. boats, you have got to fill them up from stem. to stern in order to get them down to the marks. Would that naturally ef- fect the strength of the boat any to have it distributed evenly right through? Mr. Logan--Yes, that would throw more strain on her than if you could five middle 'go should be taken out of them fa rl ed to. have loaded further strained. high, and even load the ends heavier, but that y ut couldn't avoid with coal.: = Mr. Coulby--The point that Bailey makes' is, that when these boats «are at the ore docks and they are being unloaded, I suppose, of course, the cars even. We have got to use water hold them down, but that would ont be a temporary strain. Mr. Logan--That wouldn't affect, her materially like in a sea. Mr. Coulby--Where she vod ge her bumps would be by taking her out side; the more she was racked around, the more strains she would be subject It is just like a building in. th course of construction--you bring ex cessive strains upon the different part until you finally fasten them all up. Mr. Logan--Yes, if you should se her out among the waves with a fei inches belly on her she would beats Capt. Jollie--We are handset little on this unloading business. boats are so high that the rigs won' clear, and: we are handicapped to abou 50 in. of water. We dare not put any water in aft as it leaves her bow too if it wasn't for thi we dare not do it on account of t leaky tanks. This virtually brings nearly all the weight on the forward end of the boat. - Mr. EU Ms that is only