80 



EXPEIUMENTS WITH luMZEM AIR. 



lai'ijer piece of pliosiilioriis than above. Tlie larger contleuser, K 4, is uow tbe 

 standard, admitting of easier adjustment. The graphs, figure 10, throw additional 

 light oil the results. Numerals on the curves show the order of measurement, etc. 

 Figure sIkavs the fluctuations of the standard, K 4, di.splaceJ .OU'2 in ordinate. 



In taljle 4 the ionizing activity of phosphorus is exhibited when the condenser, 

 K 4, is left (piite without interference. A lenuirkable rise and fall is, as usual, ap- 

 parent, without disceinible cause. The curve is given in figure !), displaced .001 

 in ordinate. After this, the other condensers are again tested with the object of 

 seeming surticient data to at least roughly suggest the form of the locus. 



2 mip 



Figs. 3 to 15. — Charts Showing Successive Electrometer Deflections (s), and their Derivatives, 

 IN THE Lapse of Time (/), for Different Radii (A) of the Condensers. A'«,=:jt(/(logF)/<//. 



7. Summanj. — In view of the fact that the ionizing potency of phosphorus 

 sometimes increases and at other times decreases, as it were, incidentally and sub- 

 ject to ai'bitrary conditions not easily made out, I have in the following table, 5, 

 summarized the uncorrected vahies of tlie currents, 6 f</s f, preferably to the cor- 

 rected values. The former, as has been stated, usually show greater regularity 

 than the latter, ujjon which the fluctuations of the standard condeu.sers have been 

 imposed. 



