1877.] 



Thickness of Soap Films. 



343 



Column IV. gives the observed resistance of the cylindrical film ex- 

 pressed in megohms. 



Table II. 



Time of 

 observa- 

 tion, 



Breadth 

 of ring of 

 black in 

 mm. 



Colours of rest 

 of cylinder. 



Total 

 resistance of 

 cylinder in 

 megohms. 



Eesistance 

 of coloured 

 portions. 



Eesistance 

 of black 

 per mm. 



I. 



n. 



in. 



IV. 



V. 



VI. 



h. m. 

 12 11-5 



14 



17 



30 

 36 



39-75 



45 - 75 



48 



51-5 



55 



57-5 



1 1 

 5 



7-75 



2 12 

 22-5 



4 20 

 Later . . 



1 12-5 

 20 



2 



3 30 



12 1 



2-86 



10 



345 



17-25 



3-60 



54 



4-70 



59-5 



472 



1 3 



4-80 



42 



5-55 



2 4-75 



5-70 



2 38-5 



6-15 



4 9 



7-25 



2-70 

 2-83 



2- 99 



3- 66 

 404 



4- 26 

 4-55 

 4-72 



4- 90 



5- 08 

 5-20 

 5-38 



5- 59 

 573 



6- 30 

 635 

 8-00 

 8-77 

 960 



7-82 



2-25 

 1-90 



1- 40 



2- 50 



8-90 

 11-87 



Cylinder No. I., April 5, Temp. 13°*6. 



Blue 2 to red 4 



■ Green 2 to red 4 



V Green 2 to green 4 



| Yellow 2 to green 4 



Orange 2 to green 3 

 Orange 2 to purple 3 

 Yellow 2 

 Orange 2 



Green 3 



Yellow 2 to green 4 



Orange 2 to green 3 

 Yellow 2 



5-92 



■931 



1-848 



6-12 



•929 



1-834 



6-42 



•929 



T836 



7-69 



•925 



1-848 



8-23 



•935 



1-806 



8*53' 



•936 



1-783 



8-83 



•951 



1-732 



9-15 



•970 



1-733 



9-45 



•964 



1-732 



9-75 



■968 



1-729 



10-00 



•967 



1-737 



10-30 



•964 



1-735 



10-70 



•926 



1-748 



11-00 



•923 



1-759 



12-80 



1-113 



1-855 



12-95 



1-245 



1-843 



15-30 



1-434 



1-733 



16-90 



1-299 



1-779 



18-30 



1176 



1-784 



Lpril 6, Temp. 13°- 9. 





[ 14-50 



| -910 



| 1-738 



III., April 9. 





i 5-00 



1-155 



1-709 



4-60 



1-223 



1-777 



3-77 



1-325 



1-746 



6-17 



1-794 



1-750 



Cylinder No, IV., April 10, Temp. 13°-3 

 Yellow 2 to green 5 J 



Orange 2 to red 3 



Red 2 to purple 3 I 

 Red 2 

 Orange 2 

 Yellow 2 



Cylinder No. V 



Yellow 2 I 

 Blue 2 



5-76 



•897 



1-700 



6-75 



•901 



1-695 



6-86 



•907 



1-654 



8-87 



1-064 



1-661 



9-17 



1-074 



1-715 



9-27 



1-054 



1-712 



10-70 



1-164 



1-718 



11-18 



1-408 



1-714 



11-97 



1-454 



1-710 



13-48 



1-495 



1-653 



., April 12. 





16-77 



1-402 



1-727 



22-24 



1-350 



1-760 



Column V. the resistance of the coloured portion, 

 described, and also expressed in megohms. 



calculated as above 



