56 



THE 9TEDCTUEE OF TlIE KUCLEUS. 

 TABLE i— SECOND SERIES. 



Kxliau&tiun 

 No.. : 



Time. 



Coruna, etc. 



Aperture, 



Observed, 



Computed, 

 d-K io» 



Computed, 

 d X lo' 



' Persistent small coronas due to shaking. How fast they would otherwise vanish is shown by the computed </. 

 »d„ = 207 X io-°; li = .119. 

 ' d„ = 154 X 10-'; P — .136. 



4. Results interpreted. — As the coronas do not begin to be clear until after 

 the Gth oi- 7tli e.xliaustion, the size of the initial particles must be computed. Using 

 the equation for the number of particles after z exhaustion,?, N, deduced in the 

 preceding chapter, N= io-(' + ''''>'°8 7^ y — .825 if the computation is made adiabati- 

 cally, while the corrected value for water was y = .819. Neither of these values 

 is applicable without investigation ; and b, the coefficient of the time losses, cannot 

 be the same here as above, in view of the shaking needed to keep the coronas 

 annular. It may be worth wliile, however, to compare the values, JV= 10 -■""■'- 

 (corrected for preci2)itation), applicable in the case of water, with the results of the 

 table, using the exhaustions fiom 3=5 to 2=10 of the second part for the 

 purpose. 



Since d = d^ ^ \/N= d^ ^10-'°°'' = d^ 10 "^s*' for water, put d=d^ 10 "% 

 whence /3 = 8 (log d)/^. Utilizing tlie first four observations of the first part of 

 the table, the mean values found are 



p = .17G and r/o= .0000435 cm. 



The figure shows good agreement between the observed and the computed results, 

 but the large value of y3 as conii)ared with water (/3 = .0083), and the small value 

 of rfg ai'e noteworth)'. 



In the second part of the table, G olwervations are available {z = 5 to 3 = 10), 

 after which the distortion at a, already indicated, begins. A variety of pairs of 

 values of p and d^ were tested : /3 = .119 and //„= 207/10» show too little curv- 

 ature, the direct means, p—.\'^& and </q=. 000154, are still deficient but may be 



