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 dra%Mi 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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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 

 verticalsectionmay be further emphasized by erasing all tlie 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. 



