86 Prof. A. Wehneit on the Discharge of 



Table III. 

 Relation connecting Cathode Drop (K) with Current (i) at a 



glowing CaO-Cathode, at Constant Temperature (T) and 



Constant Pressure {p). 



T=752° 

 ^=0-83 mm. Hg. 



i, 10— 3 amp. 

 K in volts. 



0-026 

 1-2 



0-053 

 3-2 



0-057 

 6-5 



01 

 33-7 



0-16 

 61 









T=820° 

 _p=0-84 mm. Hg, 



i, 10—3 amp. 

 K in volts. 



0-035 

 0-9 



0-14 

 1-36 



02 



2-9 



0-28 

 10-2 



0-41 



28-4 



0-54 



43-2 



0-68 

 54-8 



1 

 76-2 



■ 



T=895° 

 ^=0 - 84 mm. Hg. 



i, 10—3 amp. 

 K in volts. 



0-025 

 1-14 



0-11 

 1-53 



0-27 

 1-53 



0-41 

 2-22 



0-48 

 295 



0-55 

 3-24 



0-68 

 15-S 



1 



30-7 



T=984° 

 jp=0-87 mm. Hg. 



i, 10-3 amp. 

 K in volts. 



0-028 

 ! 1-2 



0-14 

 1-5 



0-28 

 1-6 



0-41 

 1-7 



0-55 



1-8 



0-75 

 1-9 



1 



2 



2-3 

 25 



Fig. 3 exhibits these results graphically. The curves show 



Fi<r. 3. 



Milliampere. 



that up to a certain value of the current, characteristic of 

 each temperature and increasing with rise of temperature, the 

 cathode drop is nearly constant and very small [the small 

 residual potential difference of from 1 to 2 volts between the 



