186 Mr Almy, On a Diminution of the Potential Difference, etc. 



Table III. Potential difference in tube. 



Gas pressure 



Without 

 magnet 



Magnet nor- 

 mal to tube 



Magnet paral- 

 lel to tube 



0-28 



3200 



2600 



2750 



0-15 



3600 



3000 



3100 



0-10 



4000 



3250 



3350 



0-06 



4800 



4000 



4100 



0-04 



5400 



4500 



4700 



0-03 



5800 



4800 



5000 



0-02 



6800 



5500 



5800 



0-016 



8400 



6100 





0-010 



28000 



7500 





0-007 



34000 



9600 





Table IV. 



Cathode 





















Area 



0-12 



0-28 



0-78 



1-13 



1-77 



2-54 



3-14 



3-80 



5-30 



Without 





















magnet, 





















Spark Gap 



1-93 



2-01 



2-27 



2-36 



2-6 



5-55 



9-00 



12-4 



14-1 



Poten.-Diff. 



27 



28 



28 



31 



33 



63 



96 



110 



132 



With 





















magnet, 





















Spark Gap 



1-90 



1-93 



2-01 



2-06 



2-14 



2-27 



2-40 



3-00 



4-10 



Poten.-Diff. 



27 



27 



27-5 



28-5 



29-2 



30 



30-3 



31-5 



48 



