46 



EXPEEIMENa"S WITH IONIZED AIR. 



TABLE 3.— EFFECT OF TEMTERATURE ON THE IONIZING AC ITVITY OF 



PHOSPHORUS. 



DIFF. POIENTIAL, 60 VOLTS. 

 OF PLATES, 3 cm. 



DISTANCE APART 



TABLE 4.— LEAKAGE OF CONDENSER DUE TO PHOSPHORUS EMANATION. 



T). Fall of potential in the lapse of time. — After tliese jnelimiiiarie.s llie le;ik;ige 

 of the condenser in the course of time when the air space is ionized by phosphoi lis 

 is next to be oonsideied. The method was essentially like the preceding except 

 that longer intervals of time were given to each set of observations. Tal)le 4 shows 

 the leakage through the condenser V, P, figure 2, when the plates are 4 cm. a[)art, 

 a relatively large distance. The exponential character of the law ( F= F„10" *■'') 

 is obvious from the chart, figure 5, but the leakage is throughout faster than can be 



