Cathode and Anode in a Geissler Tube. 



457 



this minimum coincides with that found by Ebert * at which 

 a discontinuity occurs in the relationship between pressure 

 and width of the dark space, and further experiments on this 

 point are in progress. 



■2<rc- 

 ■iq- 

 l&— 



>7— 

 /(,- 



is— 



73— 



$ UTV4 2JT- 



v?a.-rutrn-dL ox.id%® 



■^''6. 





w< 



-x--x -x- 



-a,+ 



/f-ln-hi fT^Sfure. 



a 



i 



§ 5. Anode Temperature. — By using the same electrode 

 and reversing the current in the tube, the anode temperature 

 could be investigated. 



The following tables show the results obtained. 



Table XII.— Air. 



Pressure = 2*7 mm. 



Table XIII.— Air. 

 Pressure = 1*05 mm. 



i. 



T (°C). 



0-0019 

 0-0038 

 00051 

 00065 

 0-0071 



2-55 

 4-80 

 6-70 

 900 

 9-35 



i. 



T(°C). 



0-0036 

 0-0050 

 0-0074 

 0-0081 



34 

 4-9 



6-8 



7-5 



Table XIV.— Air. 

 Pressure = 0*63 mm. 



i. 



T (°C). 



00013 

 0-0024 

 00052 



1-5 



28 

 54 



* Ebert, Ver. Deut. Phys. Ges. ii. p. 99 (1900), 



