84 



A CONTINUOUS RECORD OF ATMOSPHERIC NUCLEATION. 



w = 4.7 X lo '^ grams, and therefore, as above, 72 = 3655'. The constancy of 5 is 

 less evident than above, being in the respective series 



the variabiHty being, however, largely due to the accidental delays inevitably 

 encountered in observing. Nevertheless some other cause is at work simul- 

 taneously toward the end of the series. Here the nuclei are not removed 

 apparently. 



The mean value 5 = 5.8 will be accepted for the body of the observations, 

 but toward the end of the series the special values computed for 5 will be in- 

 serted as well as the alternative mean values. The ratio of heights of the 

 condensation chambers here and above is 11/26 = .42, while the inverse ratio 

 of the subsidence constants is 2. 6/5. 8 = .45, showing close consistency for ex- 

 periments of the present kind. Table 13 for 6p=i'j cm. will now be intelligible. 



Since n = 6m/7id\ it follows that d= .o2in'''^\ so that the last column 

 follows from the preceding. 



The charts, figures 8 and 9, corresponding to these tables, show the cycles 

 already mapped out above, but less distinctly, from the difficulty of maintaining 

 homogeneous nucleation. Naturally, the large coronas, being vague in outline, 

 are difficult to measure, and the middle cycle thus comes out clearest. 



T.\BLE 13.— CONSTANTS OF CORONAS. CONDENSATION CHAMBER 55 cm. LONG, 

 II cm. HIGH, 16 cm. DEEP; DISTANCES FROM EYE AND SOURCE, 85 cm. 

 AND 250 cm. RESPECTIVELY; 6 = 21°; BAROM., 75.6 cm.; dp=i6.g cm. ; y = .■;■;■ 

 yS = o; 5 = 5.8; a' = .oo32; a" = .oo2g; w = 4.7 X 10""^; w<,= i73ooo; 5 MEASURED 

 TO OUTER EDGE OF FIRST RING; PHOSPHORUS NUCLEI; ELECTRIC ARC. 



First Series. — Ruby Light. 



1 Streaks of color and horizontal bands visible. 

 > Alternative, 11200, 3300. 



S for normal coronas specially computed. 



