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 

 Eto E' 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 i is the current in amperes. 

 At 2'08 mms. the formula for X is 



X = 51-6 - 924*. 

 Table V. 



Pressure 2-81 mm. 



Pressure 2-08 mm. 



Electric Intensity 

 (Volts per cm.) 



Current 



Electric Intensity 

 (Volts per cm.) 



Current 



57-0 

 56-1 

 54-0 

 50-6 



4-05 x 10- 3 

 5-05 „ 

 7-75 „ 

 11-50 „ 



50-8 

 49-8 

 49-4 

 47-6 

 45-4 

 44-3 



0-90 x 10- 3 

 1-26 „ 

 2-08 „ 

 3-88 „ 

 7-04 „ 

 7-94 „ 



Pressure 1-52 mm. 



Pressure 1-125 mm. 



Electric Intensity 

 (Volts per cm.) 



Current 



Electric Intensity 

 (Volts per cm.) 



Current 



40-2 

 40-2 

 40-4 

 40-9 

 40-7 

 39-9 

 38-2 

 37-4 



1-17 xlO- 3 

 1-35 „ 

 1-98 „ 



2-80 „ 

 3-25 „ 

 4-96 „ 

 7-30 „ 

 9-20 „ 



31-7 

 31-1 

 30-8 

 30-8 

 31-3 

 30-8 

 30-3 



5-3 x 10- 4 

 6-03 „ 



7-80 „ 



8-84 „ 

 10-20 „ 

 14-35 „ 

 22-60 „ 



