Properties of Thin Metal Films. 66'6 



Table IV.— Effect of Heat on Platinum Films. 



Time films were heated and 

 temperature. 



No. 20 

 Resistance. 



— 1 



No. 24 

 Resistance. 



Initial resistance 



14-84 

 1052 



51-90 

 33-30 



Heated for 30 hours to 100° C. ... 



9 „ more to 90° C. 



10-322 



32-115 



9 „ „ 100° C. 



10-305 



31945 



60 „ „ 110° C. 



10-05 



2866 



Table V. gives the results obtained for a number of films. 

 The resistances of the films were measured immediately after 

 they were made. They were then heated for sixty hours in 

 a hot-air bath to a temperature of 110° C. and their resistance 

 again measured. 



Duplicates on optical glass and glass strips were made in 

 the cases marked with an asterisk. In some of the others 

 two films were made at the sa ne time on glass strips and the 



Table V. — Resistance of Platinum Films. 





D: 



mensions in cm. 







Resistance 





I 



















Res. per 









■ 











| 



cm. 











Time of 





After 







■ square >< 



fo.of 



Length. 



Breadth 



Thickness. 



deposit 



Before 



heating 



per cm. 



; per cm. 



time of 



ilm. 









in min. 



heating. 



1 



60 hrs. tc 

 110° C. 



> square. 



cube 

 XlO 6 . 



deposit. 



9* 



1-25 



1-3 



17-6x10-* 



40 



(V91 



4-89 



5-086 



90 



203 



8* 



115 



1-25 



10-4 „ 



25 



794 



684 



7-43 



77 



186 



>0* 



1-35 



125 



944 „ 



15 



14-84 



1005 



9-306 



84 



140 



VI* 



11 



T25 



5-49 „ 



13 



14-37 



1150 



13-06 



72 



170 



'3* 



1-4 



1-25 



497 „ 



9 



27-25 



20-23 



1806 



90 



163 



54* 



1-2 



1-25 



302 „ 



6 



51-90 



2866 



29-85 



90 



179 



10* 



1-35 



1-3 



1-87 „ 



H 



71T7 



54-50 



52-48 



98 



236 



1 



125 



1-25 



1-66 „ 



4 



76-87 



5«-46 



58-46 



97 



234 



8A 



IT 



1-3 



1-41 „ 



3 



102-05 



49 73 



58-77 1 

 56-08 J 



81 



176 



8B 



1*15 



1-3 



1-41 ,, 



3 



101-80 



4961 



178 







1-2 



1-35 



1 17 „ 



24 



167-7 



68-61 



77-18 



90 



182 



4A 



1-35 



1-3 



0-94 „ 



2 



397 



159-05 



153-16 1 

 149 95/ 



142 



306 



4B 



1-4 



13 



94 „ 



2 j 



498 



16105 



1 



105 



105 



0-7 „ 



H i 



815-7 



168*6 



168-6 



118 



253 



5 A 



1-45 



1-27 



0-47 „ 



1 



950-5 



480-8 



421-11 1 



378-34 f 



188 i 



421 



5£ 



1-30 



T25 



0-47 „ 



1 



1082-5 



3934 



378 



6A 



115 



1-3 



036 „ 



45 se ?. : 



1755 



563-8 



63734 I ' 



222 



478 



6B 



1-30 



1-25 



036 „ 



45 „ 



2150 



6230 



599-04 } , 



449 



7 



115 



1-25 



23 „ 



30 „ . 



32200 



1341 



1457-6 "1 



336 



728 



3 



IT 



T32 



0-23 „ 



30 „ 



118500 



1213 1461-1 f 



730 



& 



1-25 



1-30 



0-16 „ 



20 „ 





3xl0« 



3-12 xlO 6 



5 xlO 5 





