256 
Mr Wilson, On the Hall Effect in Gases 
Table V. contains some of the results obtained on the variation 
of the electric intensity along the discharge with the current 
These results were obtained, by turning EE' until the line joining 
E to E r coincided with the axis of the tube AB and then measuring 
the P.D. between E and E'. 
At 2 81 mms. pressure the electric intensity X can be repre- 
sented approximately by the formula 
X = 60-5 - 860t, 
where l is the current in amperes. 
At 2*08 mms. the formula for X is 
X = 51*6 - 92 4t. 
Table V. 
1 
Pressure 2*81 mm. 
Pressure 2*08 mm. 
Electric Intensity 
Electric Intensity 
flnrrpnt 
(Volts per cm.) 
(Volts per cm.) 
57*0 
4-05 x 
io- 3 
50-8 
0*90 x 
io- 3 
56-1 
5-05 
49-8 
1*26 
>> 
49-4 
2-08 
54-0 
7-75 
99 
47-6 
3-88 
)> 
50-6 
11-50 
5) 
45-4 
7-04 
>> 
44-3 
7*94 
>> 
Pressure 1*52 mm. 
Pressure 1*125 mm. 
Electric Intensity 
flnrrpnt. 
(Volts per cm.) 
Electric Intensity 
(Inrrfint, 
40-2 
1-17 x 
io- 3 
(Volts per cm.) 
40-2 
1-35 
>> 
31*7 
5-3 x 
io- 4 
40*4 
1-98 
31-1 
6-03 
}) 
40*9 
2-80 
>> 
30*8 
7-80 
» 
40*7 
3-25 
ft 
30-8 
8*84 
)> 
39*9 
4-96 
ft 
31*3 
10-20 
*> 
38-2 
7*30 
ft 
30*8 
14-35 
37-4 
9-20 
ft 
30-3 
22-60 
ft 
