148 EKMAN. ON DEAD-WATER. [nobw. pol. EXP 



EXPLANATION OF THE PLATES. 



PI. I. The apparatus (see pp. 54 seq.). 



Fig. 1. Cross-section of the large tank. The water-level and the cross- 

 sections of larger and the smaller Frown-models are indicated. 

 The dotted lines denote the cross-section of the small tank. 

 The large tank seen from the side, Scale 1 : 20. 

 Shows the way in which the glass panes are fitted in the tank. 

 The towing apparatus. 

 Apparatus for registering velocity. 

 Arrangement for producing suitable water-layers. 

 Arrangement for cleaning the water-surface. 

 The lines of the large Fram-model. 



The arrangement for observing the waves from the side. When tak- 

 ing photographs (Fig. 1, PL XII, and PI. XIV— XVII) the oil-lamp 

 I was replaced by a flash-lamp. 



Fig. 10. The arrangement for taking the "relief-photographs" (Fig. 2, PI. XII, 

 and Figs. 1—3, PI. XIII). 



PI. II. 



Map of Scandinavia, illustrating the occurrence of dead-water according 

 to seamen's accounts (p. 8). 



PI. III. 



Maps illustrating certain accounts in Chap. I. 



