54 CONDENSATION OF VAPOR AS INDUCED BY NUCLEI AND IONS. 



TABLE 18 Continued. 



The data of table 18 are arranged as above for table 16. The adiabatic 

 drop of pressure is 10 cm. from 75.1 cm. and the relative drop therefore 

 dp3/P - 1 33 an d the volume expansion about v 1 /v = i . 107. The water 

 precipitated per cubic centimeter is about m = 2 . 2 grams per cubic 

 centimeter, in both series at 26 and 24. Hence n o. 12 8s 3 . A more 

 recent value of in will be inserted for definite purposes in section 34. 



These data are given in the charts (figs. 14 and 15) with a usual 

 distinction between observed and computed values of the coronal 

 apertures s. The divergence again begins in the region of green coronas, 

 but is here on opposed sides of the line computed for the two series. The 

 reason of this is the lack of homogeneity of the wet nucleated air, when 

 the interval between observations is but i minute. The colors of coro- 

 nas are mixed and the individual observations to this extent uncertain. 

 With these differences the periods occur in the usual way. 



An interesting result of this series is the occurrence of crimson and red 

 coronas of the first order, above the violet. In other words the initial fogs 

 soon dissolve into true coronas. But their size is difficult to estimate 

 in case of the single-source method, because of their filmy character. 



One may note that the initial nucleations ^0 = 2,320,000 and 2,470,000 

 correspond to the values of the table 19. 



30. Data for high exhaustions. The corresponding results for an 

 adiabatic drop of pressure of 27.1 cm. from 75 cm. are found in table 19. 

 There are three series. The relative drop of pressure is ^3/^ = 0.273, 

 the volume expansion 7^/^ = 1.254. Hence, in the absence of phos- 

 phorus nuclei, precipitation will take place, in the given apparatus, on 



