472 



Dr. W. F. Gr. Swann on the Electrical 



99°*8 C. are given in Table II., the last three columns giving 

 relative values of the apparent specific resistance obtained by 

 multiplying the resistances of the films by the corresponding 

 times of deposit. 



The results in Table II. present various interesting features 

 which will be discussed later, since they refer to very thin 

 films, practically all of them corresponding to films of a 

 thickness below the critical value referred to on page 467. 



The results for a set of thicker films are given in Table III.., 

 in which the first six columns labelled resistance represent 

 the results of the actual observation, and the last three 

 columns represent relative values of the specific resistance. 

 In deducing the latter, the mean observations for each 

 temperature are used. 



Although the times of deposit are the same as in Table I. 

 a greater rate of deposit was obtained by using a greater 

 discharge current. 



The curve corresponding to. Table III. is shown in fig. 2. 



Fig. 2. 



o i»0 



a. 





\ 





















. 





























































\ 



1 





















1 





















\ 







































1 















100 300 Ji.00 300 600 



Time, of •d.tposit in .seconds 



8oo 



900 



The fact that the points do not lie perfectly on a smooth 

 curve is not to be taken as an indication that the observations 

 of the resistance are unreliable to the extent of the apparent 

 error, since it is merely due to the fact that the time of 

 deposit is not necessarily proportional to the amount de- 

 posited. For instance, a change of 7 per cent, in the rate of 



