36 



VAPOR NUCLEI AND IONS. 



Table 13. Nucleation of dust-free air, energized or not, as stated, at different super - 

 saturations. Plug gas cock, 2 inches; piping i inches in bore, 2 feet long. 



dp. 



nX 10 



3 



I. Non-energized air. 



Non-energized air. Exper- 

 iments. 



II. Non-energized air. 



dp. 



XlO 



3 



II (continued). Non- 

 energized air. 



0.6 



I . 2 



i-7 



Later. 



354 

 372 

 338 

 286 

 192 

 144 



III. Air energized by radi- 

 um, on side of glass fog 

 chamber. 



67 

 56 



42 



.8 

 .0 



?1.2 

 2.0 

 56 



47 

 104 

 100 



96 



89 



47 



99 



88 



9i 

 85 



dp. 



n x io -3 . 



IV. Air energized by X- 

 rays 12 . D = 20 cm. from 

 side of fog chamber to 

 anticathode. 



400 



380 

 340 



207 

 I 

 o 



2 



I40 



24 



V. X-rays. D=^ocm. 



310 



320 



233 

 145 



o 

 o 



2 . 

 64" 



X-rays. D = 20 cm. after 

 long waiting. 



34-6 



'11 . 



g' B p, repeated. 'gyobg. 3 w p cor. *w v o g, after waiting one or more hours. *w' P cor 



after waiting but a few (10 to 15) minutes. 6 wcg. 'fog. 8 wrg. 9 g' B P. "wPcor. " w y cor. 



12 Air non-energized, fip= 34.8; *=9.6; and by X-rays. 13 w y g r large. H wrg. "wcg. 16 wobg. 

 17 w P cor. ,s g y o b g. 



Long waiting before exhaustion (to remove water nuclei) is often 

 essential. In addition to the dust-free gas, air energized by radium (10 

 mg. of a weak sample, 1 0,000 X, sealed in aluminum and acting from 

 without) and by the X-rays is treated for comparison. 



