AND STATICS UNDER THE INFLUENCE OF LIGHT. 
369 
Experiment started 5tli July, 1901. 
in the dark. The partial pressure of CL (from the variation of the height of the 
and of CO was 110 millims., when the barometer was 764‘6 millims. (21°'7) and the 
12 a.m., till Monday, 11 A.M., the barometer changed to 766‘85 (21°'4), the 
(513‘5-510‘0) 2 = 7 millims. instead of 7'2 millims., which corresponds to the variation 
whatever took place in the dark. From Monday it was left till Tuesday, 11 a.m. 
by (51‘35-51’17) 2 = 3‘6 millims. instead of 3'65 millims., corresponding to the 
was then placed in the dark of 20°‘8. The pressure of the water column in the bath 
to 512 8. Distance of acetylene light from Rubens’ thermopile =105 centims. ; from 
/ // 
TT ~ T? COD ’., 
The read 
Calculated 
the variation 
The 
tempera- 
tempera¬ 
ture of 
bath on 
Variation 
of the 
Calculated 
correction for 
Height of 
barometer, 
variation 
of the 
barometer 
of the 
manometer 
when 
ture of 
bath on 1° 
thermo¬ 
meter, 
t D . 
the T V° 
Beck¬ 
mann 
ther- 
temperature 
of the bath 
and of the 
gas mixture, 
t'r-t" r . 
t r -t r 
in millimetres, 
which is to 
be added to 
h 
at the time 
T 
(and tempera¬ 
ture). 
in milli¬ 
metres, 
h’ - li" 
(corrected 
corrections for 
temperature 
of the bath 
and for 
No. 
mometer, 
7T — 77* . 
for tern- 
atmospheric 
tr- 
perature). 
pressure 
were made. 
o 
o 
O 
millims. 
millims. ° 
millims. 
millims. 
1st curve. 
20-8 
3-47 
0 • 05* 
1-8 X 0-05 = 0-09 
763-2 (21-4) 
0-06 
0-15 
1 
-- 
'3-52 
0-04 
1-8x0-04 = 0-07 
— 
0-17 
0-04 
2 
— 
3-56 
0-36 
0-65 
— 
0-41 
0-46? 
3 
— 
3-92 
0-43 
0-77 
— 
0-29 
0-06 
4 
— 
4-35 
0-15 
0-27 
— 
0-13 
0-40 
5 
— 
4-50 
0-38 
0-68 
— 
0-28 
6-16 
6 
— 
4-88 
761-95(20-8) 
7 
— 
— 
-0-48 
-0-86 
— 
- 1-8 
-0-06 
Next day 
2nd curve. 
21-7 
4-40 
0-03 
1-8x0-03 = 00-5 
763-75(20-8) 
0-06 
2-41 
8 
— 
4-43 
0-05 
0-09 
— 
0-03 
2-52 
9 
4-48 
0-05 
0-09 
0-03 
2-52 
10 
care was taken to keep the temperature of the bath and the intensity of light constant. 
VOL. CXCIX.-A. 3 B 
