180 



180 





ISO 180- 



160 '.<J''0 



100 



O- 



:2(0 



■tA 



^100 



' r:~:~y' <ioo 



^~^- .,-100 



100 



120 



—120 



160° 159° 158° 157° 156° 155° 154° 



159° 158° 157° 156° 155° 154° 



'\S0^ y >180 

 -180'' 



,180 



.180 



23' 



22° - 



21' 



20' 



19' 



18' 



-I r 



. ^300 



-260 



Fig. 29.-- H. M. Smith cruise 12. Topography in meters of the 23.2, 

 24.0, 25.0, and 26. sigma-t surfaces. Contour interval 20 meters. 

 A. 23.2, B. 24.0, C. 25.0, and D. 26.0 surfaces. 



51 



