7 2 



A CONTINUOUS RECORD OF ATMOSPHERIC NUCLEATION. 



For the pressure difference Sp=22 cm. which will occur below, 



m= 4.2X10- 5.5X10" 6.7X10- 



For Sp = 8. 5 cm. 



m= 2.1X10- 2.6X10" 2.8X10- 



The effect of temperature on latent heat is not considered, since the data are 

 not fully known. Its effect may be i to 2 per cent. More important is the value 

 to be taken for the heat ratio y= 1.41. 



15. Resulting equations applied. From what has been stated, it follows 

 that the first quantity to be found is the initial nucleation, n , i. e., the nucleation 

 which obtains when z Z. This depends on incidental conditions, such as the 

 intensity of the ionizer, the first corona seen (Z), etc., and is therefore quite 

 arbitrary. In table i, for instance, n 4 = n . Hence 



which will be abbreviated 



This equation affords in the first place a means of computing 5. For in 

 the region of norrral coronas n is given by the apertures of the coronas. If, for 

 brevity, r z =w z /io zl 8 ", 



rU I /r,_,-(i-S/5j- l )(i-S/sO, 



from which 5 is determinable in terms of pairs of values of r and s; or S may 

 be even more simply found from two successive normal coronas. The follow- 

 ing table shows the values found for the two series in table i . 



TABLE 7. VALUES OF 5 FROM r,+,/r,_,-i-5 (i/s,!, + i/-^) +S 3 A 2 : I s|- 



