PROF. 0. W. RICHARDSON ON THE EMISSION OF ELECTRONS 
16 
Table II. —Cl 2 . 
Number of 
series. 
Mark indicating 
experimental 
points of series 
on curves. 
Initial pressure, 
millimetres of 
Fig. 
Final pressure, 
millimetres of 
Hg. 
Displacement in 
volts from volt¬ 
meter readings to 
scale position in 
fig. 7. 
Date. 
I. 
X 
0-003 
0-080 
0-00 
20/4/1917 
II. 
o 
0-002 
0-052 
-0-10 
22/4/1917 
III. 
4 
0-002 
0-002 
-0-25 
22/4/1917 
IV. 
□ 
0-002 
0-040 
- 0-55 
22/4/1917 
V. 
© 
0-003 
0-100 
- 0-70 
17/4/1917 
VI. 
9 
0-002 
0-080 
+ 0-25 
25/4/1917 
[The numbers I., &c., refer to the curves in fig. 6 as well as fig. 7.] 
Remarks on each Series. 
I. x .—-No adjustment of generator. Chemical saturation current increased uniformly 
and slowly from about 200 divisions per minute to about 800/min. and photo¬ 
electric (4355) saturation current equal to about 100/min., all with additional 
capacity 0 -01 mfd. Pump stopped and gas allowed to accumulate. 
II. O.—No adjustment. Chemical saturation current increased slowly from 310/min. 
to 508/min., photo-electric 60/min., all with 0-01 mfd. Pump stopped and gas 
accumulating. One drop per minute. 
III. —No adjustment. Chemical saturation current increased slowly from 10/min. 
to 15/min., and then towards the end rose rapidly to 300/min.; photo-electric 
12/min. ; all with 0-01 mfd. In this series the chlorine was kept immersed in 
liquid air and the pumps ru nni ng continuously. One drop per minute. 
IV. □.—No adjustment. Chemical saturation current increased slowly from 250/min. 
with 0-02 mfd. to 500 per minute with 0-04 mfd., photo-electric 18/min. with 
0-02 mfd. Pump shut oh and gas accumulating. One drop in 110 seconds. 
V. ©.—Chlorine generator shut off from apparatus and effects presumably due to 
chlorine adsorbed in the apparatus. Chemical saturation current fell slowly, 
the measured limits being 135/min. and 97/min. with 0-000121 mfd., but this 
difference is partly exaggerated by errors of measurement. Photo-electric 
370/min. with 0-000121 mfd. Pump shut off and products accumulating. Six 
drops per minute. 
VI. ®.—Chlorine generator shut off and other arrangements as in V. ©. Chemical 
saturation current rose slowly from 209/min. to 258/min. with 0-000121 mfd. 
Photo-electric (4355) saturation current 1300/min. with 0 -000121 mfd. One drop 
in 110 seconds. 
