NO. 15.] EXPLANATION OF THE PLATES. 151 



Fig. 3. Curves for calculating the maximum dead-water resistance experi- 

 enced by vessels of different shapes and in different kinds of water- 

 layers (pp. 131—133). 



PL XII. 



Fig. 1. Photograph from the side, of the larger Fram-model in dead-water; 



Experiment 162, p. 82. The photograph is completed by a sketch 



of the upper part of the Fram and her tackle. (Pp. 64—65). 

 Fig. 2. "Relief-photograph" (taken as indicated by Fig. 10, PI. I) of the 



waves in a case analogous to Fig. 1, and intended to make the 



latter clearer (pp. 64—65). 

 Figs. 3 — 4, Photographs illustrating the train of waves following a vessel under 



ordinary circumstances. 



PI. XIII. 



Photographs of dead-water waves taken obliquely from below (pp. 62—63). 

 Fig. 1. Experiment 281, p. 86. 

 Fig. 2. Experiment 282. 

 Fig. 3. Experiment 283. 



PI. XIV. 



Photographs from the side, of the small Fram-mode\ in the small tank 

 (pp. 62, and 69). 



Figs. 1—6: in a 15 cm. thick (clear) fresh-water layer on the top of (black) salt- 

 water of spec, gravity P020 and P028 respectively; towing forces 

 01-0-3 gr. 



Figs. 7 — 8: in three water-layers, black and clear allernately, with very small 

 differences of spec, gravity (p. 65). 



PI. XV. 



Photographs from the side, of the larger Fram-model in a 3 cm. thick 

 fresh-water layer; Experiments 53 — 56, p. 79. Salt-water black; fresh-water 



