NO. 15.] EXPLANATION OF THE PLATES. 149 



PI. IV and Fig. 1 PI. V. 

 Sketches illustrating the appearance of the dead-water. 



Fig. 1. Sketch by Prof. Nansen, showing the crest-lines of the waves which 

 followed the Front in dead-water (p. 11). 



Figs. 2—5. Sketches by Mr. Aanonsen (p. 19). 



Figs. 6-7. Sketches by Mr. G. A. Larsen (p. 13). 



Figs. 8— 9. Sketches by Mr. Eriksen (p. 17). (The three "rips" aft of the vessel 

 in Fig. 8, must obviously be imagined to stretch in the water- 

 surface perpendicularly to the vessel's wake, although they are 

 drawn vertical, in the plane of the paper). 



Fig. 10. Sketch by Kommandorkaptein Kroepelien (p. 20). 



Fig. 11. Sketch by Mr. Colin Archer (p. 15). 



Fig. 12. Sketch by Admiral Sparre (p. 16). 



Fig. 13. Sketch by Kaptein Scott-Hansen (p. 11). 



Fig. 14. Sketch made by the author, according to statements from Kom- 

 mendorkapten Sidner, and revised by the latter (p. 22). 



Fig. 15. Sketch by Lieutenant Wallander (p. 23). 



Fig. 1, PI. V. Sketch by Kommandorkaptein Kroepelien, illustrating the same 

 case of dead-water as Fig. 10, PI. IV (p. 20). 



PI. V, Figs. 2—5. 



Curves showing the shape of the crest-lines of dead-water waves according 

 to calculation (p. 48). (The depth of the salt-water is in the calculation, as- 

 sumed to be infinite compared to that of the fresh-water layer). 



PL VI. 



Fig. 1. (See pp. 43-44). 



Figs. 2— 3. Comparison between theory and experiment (pp. 143 144). 



Fig. 4. Graphic representation of boundary- waves ; the waves in the upper 



surface exaggerated (pp. 42—44). 

 Fig. 5. A solitary boundary-wave (p. 69). 

 Figs. 6-7. (To p. 46). 



