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July, 1909 "TRE MaARINE. KEVIEW, Mooe.. A, 199 to the upper part of the bow sections, thus bringing the fore body back to the original displacement. Fourth-- the same thing was done with the stern sections. "In this case the maximum reduction in displacement, when both bow and stern sections were reduced, amounted to about 0.64 per cent of the total displacement, and in the final modifi- cations (4) the displacement is the same as the original. The results of the various modifi- cations are shown in Fig. 6 and marked ml, m2, m3, m4. Cutting away the lower part of the bow sections made a considerable re- duction in resistance, and a_ similar effect was obtained with the modified stern. When the bow sections were brought back to their original areas by adding area above, little or no dif- ference was detected in the residwary resistance per ton of displacement. With the sectional area finally the same as the original 2B.2S, but with the sections of the vessels modified by cutting away the lower part and filling out above, the residuary resist- ance was slightly increased as shown In curve m4. A comparison of this curve with the original shows a considerable sav- ing, while compared with the form 1B.1S, the residuary resistance has been reduced nearly 50 per cent. As a matter of interest curves of residuary resistance have been added for shallow water. A complete series Fig ta at varying depths is under investiga- tion for this and other types, but is not yet completed. The two curves given correspond in depth of water 1.166 and 1.5 times the draught of the vessel. In the shallow water the model. was: run until it touched bot- tom, and in the deeper water until the resistance increased abnormally. The rapid rise in residuary resistance is most marked. In conclusion it may be observed that even in full slow-speed vessels, it is possible to effect a saving in power by proper adjustment of form to the conditions demanded. analysis of that it is advantageous to keep the water-line of vessels of this type rather full at both ends and to have the water-line near the bilge as easy as possible. buttocks. at each. end appear to give better results than those of a some- what full form below and fine above. Discussion of Prof. Sadler's Paper. President Bowles.--This paper is An the above results indicates In other words,. easy. undoubtedly one of great practical value and is now open for discussion. Henry Penton: Referring to Fig. 6. / i aM / / i 410 --_ 3 4 7 "8 AK see