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DISTRIBUTION OF MASS 
Jnformation 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—26}——_4 
