27 
In this particular figure the horizontal lines have been drawn for 
every 20 decibars. The curved lines represent lines of equal specific 
volume and are drawn for every 20 units in the fifth decimal place 
of v. In Figure 10, v' means 10° (v—0.97000). Since a solenoid 
is formed by the intersection of isobaric surfaces with isosteric 
surfaces, it is not difficult to see that a vertical plane, such as illus- 
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Fic. 11.—An effective illustration of the distribution of solenoids and the dynamic tendencies in a vertical section taken 
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approximately at right angles to both the Gulf Stream and the Labrador Current south of the Grand Banks, May 5-7, 
1922. Each whole dot represents 400 solenoids, which gives approximately 50,000 solenoids for the Gulf Stream as repre- 
sented by the black circles, and about 12,200 solenoids for the Labrador Current as shown by the white circles. 
current of the Gulf Stream is represented as flowing perpendicular to the plane of the paper toward the reader and the 
Labrador Current in the opposite direction. Horizontal scale, 1: 2,000,000; vertical scale, 1: 5,000 
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trated in Figure 10, page 26, will intersect the solenoidal tubes form- 
ing a number of parallelograms, each one of which indicates the 
presence of 400 solenoids. 
The distribution of forces tending to produce acceleration in such a 
vertical section may be further emphasized by erasing all the isobaric- 
isosteric lines after the location of the centers of the parallelograms 
have been marked out. This method of illustration is shown in 
Figure 11. 
