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ies delle oil A ala April, 1919 made it confused. The _ inclinations shown were checked when the ship was actually rolled. It will be noted that the various points marking the path along which the center of gravity moved from zero to 6 in both the sections have been numbered. ‘The right half of the diagram shows the forward section and the left half the after section. The position zero is the calculated position of the center of gravity before weights were added and number 1 the shift caused by placing all the pontoons on. board. .in their final location... The point 2 is reached when all the fixed ballast or articles of equipment are stowed and point 3 shows clearly the extent to which the center of gravity has been lowered and moved out- board by filling the port inner bottom forward compartment in each section. From 3 to 4 the wing tanks have been filled and from 4 to 5 the pontoons on the deck filled. The shift from 5 to 6 is due to pumping out the water from the port inner bottom causing the ship to come slowly to an upright position. The path of the center of buoyancy and metacenters are clearly shown. It is interesting to note the fall in the metacenter as the rectangular bilge is immersed and the water line nar- rowed, also its rise as the bilge of the pontoon enters the water, and its fall again as the ship comes upright. This diagram clearly shows that the sec- tions are perfectly stable at all times, and the actual experience with them showed that when pulled about by the tugs they were remarkably stiff. After the calculations had been completed a 14-inch scale . wooden model of the VAN HIsE was STERN SECTION READY TO BE ROLLED OVER—THE SUPERSTRUCTURE ON THE DECK IS ONE OF THE PONTOONS THE MARINE REVIEW , 17 BOW SECTION COMPLETELY ROLLED OVER AND READY TO ENTER THE LOCKS—ONE OF THE PONTOONS IS SHOWN IN PLACE AT THE WATERLINE carefully weighted and balanced to pontoons were carefully measured to agree with the calculated weights and contain the proper amount of water. centers of gravity. The tanks and When these were slowly filled the models turned slowly over on ech ‘esis side's, “without the slight- est tend- ency to flop, and came to AP! SNR by a ee Reo ee ee Y a a ree has oh s 44cn tel Parte ae oan aes