A CONTINUOUS RECORD OF ATMOSPHERIC NUCLEATION. 



8l 



standardization being throughout by subsidence. This agreement is further 

 substantiated below. The difference of values here is largely an actual differ- 

 ence in the positions of the coronas. 



The curve r=5i5s-'/io slu!0 ' if constructed in full shows the eventual 

 linear march already instanced. As above a = .062 nearly. 



The curves of nucleation, n, in terms of the relative aperture, s, indicate the 

 occurrence of four cycles, though the lower is uncertain. Both curves run in 

 parallel as nearly as the observations allow, and they show actual cases of over- 

 lapping or reentrance. 



This reentrance is particularly evident in the d curves in which four distinct 

 branches overlapping at their edges may be made out. The positions of the 

 cusps, as indicated by the green coronas, may be placed at io 6 d = 450, 650, 950, cm. 

 or about in the ratio of 3, 4, and 6 times .00015 cm - The corresponding number 

 found above was larger than this in the ratio of 18/15, while the ratio of the red 

 and blue wave lengths involved would be 1.4. 



24. Condensation chamber remote from the eye. The distances are in- 

 verted in the following experiments, being 250 cm. from the eye to the con- 

 densation chamber and 85 cm. from this to the source. All coronas therefore 

 are relatively small and the measurement of 5 by the same method much more 

 difficult, particularly in relation to standardization. Measurement of 5 was 

 naturally made to the outside of the first ring. Results with lycopodium seen 

 through ruby glass and a source of electric light gave (^ = .0032), ^ = .344 cm. 

 Hence a = d 5 =.oon and ^ = 67505'. If the value of a be reduced to the 

 conditions holding for subsidence, a" = .oon (291/336) = . 953 X io" 3 , whence n = 

 10,4005-'. Table n computed with this value follows. Unfortunately, three 

 important data were lost, and the series are deficient in this respect. 



TABLE n. CONSTANTS OF CORONAS. CHAMBER AS ABOVE. DISTANCES FROM 

 EYE AND SOURCE, 250 cm. AND 85 cm. RESPECTIVELY. 9 = 21; BAROM., 

 75. 3 cm.; 8p= 16.9 cm. ; ^ = .77; ft = o', S =. 36 ; n a = 260000; a' = .oon; a" = . 00095; 

 m = 4. 7Xio- 6 grams; s MEASURED TO OUTER EDGE OF FIRST RING; PHOS- 

 PHORUS NUCLEI; WELSBACH MANTEL. 



