150 EKMAN. ON DEAD-WATER. [norw. POL. EXP. 



Fig. 8. Experimental resistance-curves with the small Fram-model (pp. 



60-61). 

 Fig. 9. (To p. 127). 



PI. VII- VIII. 



Curves representing the variation of velocity (plotted vertically in cm./sec.) 

 with time (plotted horizontally), in some selected experiments (see pp. 67 seq.). 



A short horizontal line at the left of a diagram represents the mean velo- 

 city as given in the tables. A short vertical line across the curve (in diagrams 

 54, 77, 80, 81, 84, 103, 105, 106) indicates the moment when one of the pho- 

 tographs in PI. XV — XVII, was taken. 



PL IX. 



Figs. 1 — 2. Show the different shapes of the water-surface around a vessel ; 

 Fig. 1: at a low velocity, in dead-water; Fig. 2: at a higher velo- 

 city, without dead-water. The disturbance of the water-level ex- 

 aggerated. (Pp. 66—67). 



Fig. 3. Curves showing the disturbances of water-level, highly exaggerated 

 (pp. 66 and 118 seq.). 



PI. X. 



Fig. 1. Curves of resistance experienced by the larger Fram-model (1 : 100) 

 at different velocities and in fresh-water layers of different depths 

 on the top of salt water. The small circles at the top, indicate the 

 theoretical maximum-velocity of waves in the respective water-layers. 

 (Pp. 121 seq.). 



Figs. 2 — 3. Similar curves for different boat-models (pp. 128 seq.). 



PI. XI. 



Fig. 1. Resistance-curves showing the influence of the difference of spec, 

 gravity between the water-layers (pp. 115 seq.). 



Fig. 2. Resistance-curves in the case of several superposed strata of dif- 

 ferent densities (pp. 123—124). 



