Properties of Thin Metal Films. 

 Table II. — Resistance of Bismuth Films. 



661 





Time of 



Dime 



nsions of film in cm. 





Eesistance 



Resistance 



Number 



of film. 



deposit 

 in min. 









Eesist- 

 ance. 



per cm. 

 square. 



per cm. 

 cubexlO 6 . 













Length. 



Breadth. 



Thickness. 









2 



4 



397 



1-22 



3-83x10-6 



666-5 



204-8 



784 



3 



5 



423 



1-25 



4-76 „ 



579-7 



1713 



815 



o 



8 



390 



117 



6-70 „ 



468-7 



140-6 



942 



13 



8 



395 



1-25 



7-46 „ 



4162 



131-7 



983 



6 



10 



3-9 



1-15 



9-94 „ 



435 



128-3 



1275 



15 



11 



1-2 



0-8 



11-0 „ 



187-8 



1252 



1375 



14 



15 



1-2 



0-6 



15-6 „ 



196-4 



98-2 



1531 



I 11 



12 



3-6 



1-25 



15-6 „ 



262-8 



914 



1423 



10 



16 



405 



1-3 



17-1 „ 



220-4 



70-74 



1209 



Table III.- 



-Change of Resistance in Bismuth Films 

 with Time. 



Date. 



Temperature. 



°C. 



Eesistance of film. 



A. 



B. 



C. 



Mar. 16. 12 noon 



i „ 18, 9.35 a.m. ... 



' ., 19,12.10 p.m. ... 



„ 20, 4.35 p.m. ... 



„ 21, 3.40 p.m. ... 



., 26, 3.30 p.m. ... 



1 Apr. 3, 3.00 p.m. ... 



Mav 16 



12* 



14 

 13 

 13 

 13 

 13 



390 00 



405-1 



409-62 



411-30 



412-30 



418-40 



425-20 



3455 



359-7 



371-83 



37333 



373-83 



378-65 



383-15 



545-2 

 54725 

 552-47 

 557-25 



571-80 

 598-60 



824-7 



a short time. This was found to be typical o£ all the bismuth 

 films. The rate of increase depended on the thickness of the 

 film. The thinner the film the more rapid was the increase, 

 and for very thin films it was hardly possible to measure 

 their resistance on this account. In Table II. the resistances 

 were all measured a short time after the films were deposited. 



Longden * found that in the case of platinum the resist- 

 ance decreased with the time, and that this decrease was 

 more rapid if the films were heated, and with heating their 

 resistance finally became constant. 



Miss Stone f observed the same phenomenon for silver 

 films deposited from solutions. It was hoped that by treating 



* Physical Review, vol. xi. p. 40 (1900). 

 t Ibid. vol. vi. p. 1 (1898). 



