64 Electric Discharge in a Transverse Magnetic Field. 



27. It is not without interest to follow the variation of 

 current with pressure and potential difference. 



Curves VIII., IX., fig. 22, give the relation between 

 current and pressure in a discharge-tube (No. 1), the 

 induction-coil used giving a spark-length, in air, of 13*4. 



Fio- 22. 



Curves VIII 



. &IX 











iH^ 









i 







I 







j'flxid 



1 fVv 



; 



! t I 







] 



! i 



! 



V ! ! 











h M^ 



! i 1 



III! 











i H 



SC-CSu 



fiodei^*^ 



^L 



i 



1-OxlCK, 







i \^¥^ 













! | 



. ! 1 .1 













.B 



j i 



; | ! 









N 







Si 









i 











































-5 

 1-0x10 



s 



























5; iOJ '15 20 25 30 35 SQ> 45- ,50 55 60 65 

 > Pressure in rrr.m. 



Fijr 23 Curve. X. 



4 









~T 



III! i 



5 









; \ J ILL 



! 



5 











X i i 





i 



1 



^52-5 



5 













i 







1 



§2 



I 









i 1\TT 







t, 











i IKI! 



\ 











c 

 i 





| 





!*Ci> 



Ox,j 



-5 







1 



Ox.'O" 4 

 jrrc.it in a.np 





1 



0*10 3 



The curve X., fig. 23, gives the relation between the 

 current and potential difference. 



