ALTERNATIONS OF APERTURE DECAY. 



21 



8 10 / /fi #) 



// /3 /5 / 



6 



FIGS. 14-18. Graphs showing the alternations of the apertures (s) of coronas in non- 

 energized dust-free air. The abscissas show the numbers of the successive 

 exhaustions; the ordinates are nearly as the cube roots of the number of effi- 

 cient nuclei. 



FIG. 19. Decay of the nuclei examined in the lapse of hours. 



Table i, referred to in figs. 14, 15 and 16, will be found as table 10, p. 19. 

 Table 2, referred to in figs. 17 and 18, will be found as table n, p. 20. 

 Table 3, referred to in fig. 19, will be found as table 12, p. 22. 



19. Effect of lapse of time on the nucleation of dust-free air impris- 

 oned in the fog Chamber. The 5-minute periods in the preceding table, 

 or figure 18, do not markedly diminish the aperture of the coronas. 

 Larger periods of waiting are very effective, as is seen in table 12, 

 where v\ V shows the volume ratio of fog and vacuum chambers. The 



