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Some Model Experiments Relative Resistance of Some Models With Block Co-efficient Constant and Other Co-efficient Varied HE first paper read was Naval Constructor D. W. Taylor's pa- per on "Relative Resistance of Some Models with Block Coefficient Constant and Other Coefficients Varied", of which the abstract is as follows: This paper gives the results of an investigation into the question of the most suitable midship section coeffici- ent from the point of view of resist- ance for combinations with a given block coefficient. Twenty models were tried having block coefficients ranging from 0.56 to 0.68 and midship section coefficients ranging from: 0:86 to 1.08. .. These models weighed 2,500 pounds each in fresh water. Full information is given as to the details of shape of the models, their wetted surfaces, etc. All models were tried in deep wa- ter and also in water only 20 inches deep, a false bottom being fitted in the model basin. Results are given in the form of effective horsepower eurves in deep "water for 20° 500-ft. ships upon the lines of the model and similar curves for 20 300-ft. ships in water 25 ft. deep. Finally a diagram is given showing the relative resid- uary resistances of the models in deep and shallow water. The most im- portant conclusions indicated by the experiments are as follows: Important Conclusions In deep water for the moderate speeds covered by the experiments the larger the midship section coefficient the better. As regards resistance it would frequently pay to adopt coef- ficients materially larger than hither- to used in practice. In the very shallow water the mid- ship section coefficient should be ma- terially smaller than in deep water, but even for shallow water 'there seems to be no advantage as regards resistance in the very fine midship section of coefficients often used. A somewhat unexpected result found in shallow water was that the vessels having the finest block coefficient showed appreciably more resistance than those having fuller blocks. In view of the present limited knowledge of the exact influence of various fea- tures of form upon shallow water re- sistance it is pointed out that there are possibilities of great gain by special model basin investigations of important vessels intended for shal- low water service. The paper was discussed by Prof. C. H. Peabody, who stated that Mr. Taylor's investigations were more im- portant than those presented by any other, investigators except William Froude and 'his son. Prot. H. CG. Sadler stated® that. the charts show all the results which have been obtained from these experiments. They are especially interesting, and are particularly so to me, who has followed the, building of our Sound steamers for so many*-years. It is interesting to note that the model represented here, 60 per cent block coefficient and 98 per cent midship co- NAVAL CONSTRUCTOR DAVID W. TAYLOR results which he had obtained sonally in shallow water those of Mr. Taylor. Stevenson Taylor:--It is impog- sible to discuss this paper, excepting by those who have performed Same sort of experiments. per- confirmed the The efficient, corresponds very closely to the old steamers, the Priscilla and the Providence, which were, in their day, the greatest advance in the con- struction of that class that time, or since then. of vessel at These lines have been followed very closely from