84 CONSTRUCTION OF ISOBARIC CHARTS 



phere bounded by vertical Avails through any two adjacent curves of these maps, and 

 by the two level surfaces of gravity, V= Vo and V= Fj, embraces 



mile^ 



0.16945 po , r moment-solenoids, 



•^ hour 



mile^ 

 or 131.05 pi r 2" moment-solenoids, 



mile 



or 1 X p> s 9 moment-solenoids 



'^~ hour 



according to the standard unit that we adopt. 



These moment-solenoids tend to direct the specific quantity of motion upward 

 at places where Tl\\ is small, and downward at points where n',';is large. Accord- 

 ingly, the air lying between the level surfaces V = and F=40 000 (see Fig. 4) 

 will be pushed upward most strongly in the region northeastward from Omaha. 

 The n^2 JJJjJJ-map (see Fig. 9) shows the greatest ascensive tendency to be over Topeka, 

 and the n^^^-map (see Fig. 5) shows the greatest upward force to be westward 

 from Pierre. 



With the aid of these n[:.-maps such numerical examples showing the specific 

 quantity of motion can be computed, just as corresponding examples for the velocity 

 were computed from the E^j-maps. It seems to me, however, that from a dynamical 

 point of view the specific quantity of motion is a less convenient quantity than the 

 velocity. Probably the n {'^-charts will only be used in working on certain special 

 problems, such as the comparison of movements in media of such different densities, 

 as the air and the ocean ; or when one wishes to calculate the mass of air transported 

 by the winds. 



VI. 



Concluding Remarks. 



The connection of the charts that we have here drawn for the higher atmospheric 

 strata with the dynamics of the atmosphere must be clear from the preceding pages. 

 It is to be expected that upon such maps we may easily and naturally present our ob- 

 servations and experience as to atmospheric movements and therefore, it would seem 

 to promise good results if the daily weather-predictions could be based upon such 

 maps. At least this latter is practicable in so far as it would require not more than 

 an hour to work up the data necessary for the telegraphic reports from the kite sta- 

 tions. Certainly within one and a half hours after the descent of the last kite these 

 maps could be drawn and finished at the central office of the Weather Bureau. 



