204 
PHYSICS: LOEB AND SCHMIEDESKAMP Proc. N. A. S 
control as above. The results obtained on three samples are tabulated 
below. 
FRENCH 
SAMPLE NO. 2 
Intensity 
Time in hours 
Date 
Comments 
1.00 
0 
3-21-21 
0.74 
3-27-21 
0 7fi 
1 
3-30-21 
0.67 
221 
4- 2-21 
0.66 
315 
4- 6-21 
0.57 
428 
4-11-21 
0.69 
527 
4-14-21 
Exposed to Cl 2 contamination? 
in air of room 
0.51 
665 
4-20-21 
0.95 
689 
4-22-21 
Exposed to Cl 2 contamination 
in air of room 
0.71 
834 
4-28-21 
0.84 
858 
4-29-21 
After 24 hrs. in Cl 2 gas in flask 
TJD T?TVT/"»TT 
±* JKivJN Cti 
SAMPLE NO. 
3 
Intensity 
Time in hours 
Date 
Comments 
1.00 
o 
3-25-21 
1 .00 
3-26-21 
.43 
64 
3-28-21 
.41 
101 
3-30-21 
.34 
163 
4- 2-21 
23 
257 
4- 6-21 
.24 
370 
4-11-21 
24 
466 
4-14-21 
Slight Cl 2 contamination in? 
.27 
604 
4-20-21 
air of room 
.49 
628' 
4-22-21 
Exposed to strong Cl 2 in air 
of room 
.30 
771 
4-28-21 
2fi 
033 
5- 9-21 
AMERICAN SAMPLE 
Intensity 
Time in hours 
Date 
Comments 
i no 
0 
3-30-21 
.84 
95 
4- 2-21 
.59 
304 
4-11-21 
.60 
399 
4-14-21 
Slight CI2 contamination in; 
air of room 
.82 
589 
4-22-21 
Exposed to strong CI2 con- 
tamination in air of room 
.80 
728 
4-28-21 
.57 
818 
5-2-21 
.53 
986 
5-9-21 
In the first column are given the intensities of the specimens compared 
to the controls corresponding to the number of hours exposure to the 
ultra violet light recorded in the second column. In the third column 
are given the dates on which the measurements were made; while the 
fourth column is reserved for comments. In every case it may be seen 
that there is a marked reduction in the phosphorescent intensity with 
