THE ELECTRICAL RESISTANCE OF THIN LIQUID FILMS. 
481 
Table VII. 
Class T. 
I. 
II. 
III. 
September 27 
II. 
-0-003 
27 . 
III. 
+ 0-017 
28 . 
I. 
-0-017 
28 . 
III. 
o-ooo 
30 . 
I. 
-0-017 
„ 30 . 
II. 
— 0’005 
u-i— O'OIO 
a = -0-005 
Class III. 
I. 
II. 
III. 
September 18 
II. 
+ 0-050 
20 . 
I- 
+ 0-171 
20 . 
II. 
+ 0-084 
22 
33 - 
I. 
+ 0-021 
27 . 
33 
I- 
1 
+ 0-040 
/P= 0-074 
/ 
3 = +0-074 
Class II. 
I. 
II. 
III. 
September 18 
„ 20 . 
23 . 
I. 
III. 
I. 
+ 0-022 
+ 0-039 
+ 0-019 
/p= 0-027 
+0-027 
Class IV. 
I. 
II. 
m. 
September 24 
„ 24 . 
25 . 
29 . 
,. 29 . 
October 1 . 
„ 1. . . 
„ 1. . . 
I. 
11. 
I. 
I. 
II. 
I. 
II. 
III. 
+ 0-136 
+ 0-169 
-0029 
+ 0-073 
+ 0-128 
+ 0-003 
+ 0-024 
+ 0-116 
/i x = 0"085 
!>,= +0-078 
The conclusion to be drawn from this table is obvious. The divergence from Ohm’s 
law increases rapidly as the conditions become less and less favourable to the pre¬ 
servation of the film in a constant state. The amount of the divergence shown by 
films in the same class varies considerably ; but this is accounted for by the fact that 
the range of thickness observed, the time during which the film lasted, and the amount 
of change in the hygrometer and thermometer during that time, are very irregular. 
There is only one film, however, for which the figure in column III. is less than those 
which occur in Class I. In the case of this film (October 1, I.) none of the usual pre¬ 
cautions were taken, but two dishes of dilute sulphuric acid (specific gravity 1*1/59) were 
introduced into the inner chamber. The hygrometer and thermometer read 50° and 
17°'5 respectively at the commencement of the observations, and each had risen only 
0T of a degree at the end. The specific resistance of the film at 20° was 153’4. This 
number differs less from the specific resistance of the liquid in mass than those often 
