30 
The isosteric lines, Figure 10, page 26, represent in vertical section, 
the distribution of the specific volume in situ (v). But except in 
regions where rapid currents prevail, the lines of equal specific volume 
vary little, especially in the greater depths, from either the lines of 
equal pressure or the lines of equal depth. This is due to the fact 
that the effect of the increasing pressures with the depth more than 
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This is an example of the most approved method of illustrating in vertical profile the dynamic conditions found prevailing 
Fic. 12,—A dynamic section constructed from the values of the anomalies of specific volume (V—Y3) 104 at stations 206 to 201. 
inawatermass. Horizontal scale, 1: 2,000,000; vertical, 1: 5,000 
offset the variations in the specific volume due purely to temperature 
or salinity variations. In order to secure a more striking graphic 
representation of the distribution of specific volume in situ, it is 
customary to draw the isosteres in accordance with the values of 
V—V, (see computations, column 15, p. 28). Although these ciphers 
are of a smaller numerical value than the actual specific volumes, yet 
they provide a greater contrast than the latter, and a section thus 
