68 



CONSTRUCTION OF ISOBARIC CHARTS 



the value of t^ in every isobaric surface above Omaha for 23 Sept., 1898, 8 A. M. 

 This curve is shown in Fig. 3. 



From this curve the following average values of t^ are easily read off: 



Between p = 28.496 and p = 28.000 



p = 28.0 

 p = 27.5 

 ;j=27.0 

 p = 26.5 

 p = 26.0 

 p = 25.5 

 p = 25.0 

 p = 24.5 

 p = 24.0 

 p = 23.5 

 p = 23.0 



p = 27.5 

 p = 27.0 

 p = 26.5 

 p = 26.0 

 p = 25.5 

 p = 25.0 

 p = 24.5 

 p = 24.0 

 p = 23.5 

 p = 23.0 

 p = 22.5 



= 6a.o 



= 71.0 

 = 73.0 

 = 74.0 

 = 73.5 

 = 72.0 

 = 71.0 

 = 70.0 

 = 69.5 

 = 67.5 

 = 65.0 

 = 62.5 



For these values of t^ and p we obtain from Table 9 



and, by the aid of Tables 12 and 13, the following values 



Fjgo = 25 930 

 K, 5 = 33 550 

 F^.o = 41 350 

 F»,, = 49 310 



Fe.„ = 57 410 



F23.3 = 65 640 

 F^o = 74 020 

 F,^.5 = 82 550 



Fj4.,= 91 250 

 F„3.5 = 100 100 

 F23.„=109 100 

 F22.5=118 250 



By bringing together the preceding results we may arrange a convenient tabular 

 form as in Table 15 for working up the results of a kite ascension at a kite-station. 

 As an example I have collected in this Table 15, the results already worked out for 

 the observations at Omaha, 23 Sept., 1898. 



