34 



A CONTINUOUS RECORD OF ATMOSPHERIC NUCLEATION. 



Another peculiarity may here be referred to: when the radial jet is very 

 active it is capable of charging the neutral condenser. This, however, is not 

 usually the case with a jet striking water. The following table, in which 5 

 denotes the galvanometer deflection, shows that the radial jet, when shattered 

 on a rigid obstacle, does not always convey charge. 



TABLE 16.— CONDENSER 1 CHARGED BY RADIAL JET. dV/dt=2 lit./min. 



dV/dt = ^.f, lit./min. 



Charge, 5 = 

 Leakage, 5 = 



Combined capacity 409 cm.; 5 volts per scale part. 



In these experiments non-symmetrical charge was not detected when the 

 nuclei from the radial jet passed through the uncharged and insulated condenser. 

 This was even true when the air current carrying the nuclei was increased to 

 nearly 5 liters per minute. Reasons for this diversity of behavior have yet to 

 be sought. 



17. Effective condenser length. — It is finally desirable to ascertain whether 

 the charges of water nuclei are actually lost to a few per cent, in the first few 

 centimeters of the condenser, very near the influx tube. A condenser was 

 therefore constructed the length of which could be varied by placing earthed 

 tubes, 2r^ = 2.i cm. in diameter and of different lengths, / = 6o, 30, and 15 cms., 

 around a fixed charged insulated core, 2r, = .64 cm., concentrically, with the 

 usual precautions. 



S-^ 



,.,9, 



A 



^ 



o 



A 



^ 



,^ f^^ 



^^rn 



Figure 9, — Tube Condenser with Sliding and Removable Outer Coating. 



Figure 9 shows the apparatus where r is the inner and C the outer coating 

 of the condenser, the latter held in the sleeves, II. The insulators and the 



