fK 



19 



Table IV 



DISTRIBUTION OF MASS 



Information as to the distribution of mass in a free-moving media, 

 such as in an ocean, furnishes a direct insight of the dynamic condi- 

 tions there. Representation of mass distribution is clearly shown 

 by isosteric lines, which in profile form, after all corrections have 

 been made, including that of compressibility, is called a dynamic 

 section. An example of such is to be seen in Figure 12, page 30, 

 which has been constructed from a group of stations taken by the 

 International Ice Patrol, 1922, and extended in a line across two cur- 

 rents in the ice regions south of Newfoundland. 



The importance of the position of isosteric surfaces as an indicator 

 of the motions taking place in a water mass, was pointed out in a pre- 

 vious paragraph. Enlargement of this exposition can be continued 

 hereby regarding such a vertical section where a system of isobaric 

 and isosteric surfaces, by intersection with the vertical plane, divide the 

 latter into a set of parallelograms. If we extend the vision to three 

 dimensions, then the parallelograms take form as a set of tubes. 



71321— 26t i 



