ON THE LIMITING THICKNESS OF LIQUID FILMS. 
G59 
experiments failed, as too many films broke before they were ready for observation, or, 
as some slight disarrangement of the apparatus was observed, which would invalidate 
the observations. 
Two observations on the soap solutions gave results so widely different from the 
rest that they are omitted as probably incorrect. With these exceptions all the 
results obtained are included in the tables. 
Column I. gives the number of minutes which elapsed after the tubes were set up, 
before the films were broken in tubes 1 and 2 respectively. 
Column II. gives the number of films broken in each tube. 
Column III. the average thickness of a film in millionths of a millimetre. 
Table III.—Soap Solution. 
I. 
II. 
1. 
2. 
1. 
2. 
40 
50 
21 
30 
30 
40 
32 
46 
160 
180 
34 
29 
30 
35 
23 
26 
90 
95 
36 
33 
37 
40 
174* 
184* 
35 
45 
17 
13 
33 
40 
24 
20 
33 
40 
34|* 
32 
hi. 
14-4 
117 
11-9 
11-4 
10-6 
11-8 
13-2f 
103f 
13-4 
Mean 127 
Table IV.—Liquide Gtycerique. 
I. 
II. 
III. 
1 . 
2. 
1 . 
2. 
87 
93 
354* 
31 
10-6 
85 
93 
27 
30 
10-2 
80 
85 
28 
32 
12-5 
60 
63 
52 
51 
107 
65 
70 
50 
49 
10-2 
75 
82 
49 
45 
11-0 
65 
63 
54 
49 
9-4 
Mean 107 
It will be observed that there is no relation between the time which had elapsed 
since the formation of the films and their thickness. 
* Films broke during measurements, 
f Zero very unsteady. 
