Magnetic State of Iron and its Photo- Electric Properties. 349 



carefully polished nickel were also examined in the same 

 way. A table showing the results obtained is shown. They 

 all gave negative results, i. e., there is no definite change 

 in the photo-electric current when the magnetic field is 

 excited. 







Table III. 











Angle 



of 



lighting. 



Bate of Eise of Voltage 



per sec. 





Substance. 



u- , , Surface, 



Fl i d North 



0ff - Pole. 



Surface, 

 South 

 Pole. 



Arc 



current 

 amps. 



Iron.. 



45° 





0082 



0085 



•0086 



15 





To surface. 





017 



017 



•017 



2-5 



Bismuth 



Normal 



r 



16 



16 



__ 



2-7 





to 





056 



056 



— 



1-8 





surface. 



I 



046 



046 



— 



23 









040 



040 



— 



2-3 



Magnetite .. 



— 





0078 

 0032 



0070 

 0031 



•0081 

 •0033 



2-0 

 2-2 





— 





0043 



0045 



•0044 



2-2 



Nickel 



— 





•0084 



•0079 



•0083 



1-7 





— 





•0084 



0088 



•0086 



1-7 



When no result could be obtained with the magnetic 

 field normal to the surface, some trials were made with a 



Fis:. 2. 



tTo/zpef £cruze 

 Sou 7?^ 



7o £/pcfro/7?e/e/* 



Eo/-fy?ec/ Scree/? 



0/7/yj 



F/e/d 



E/ecfro -MajfneT 



flicef 



h // //?o J //?^ 



second apparatus in which 

 parallel to the iron surface, 

 ratus used is shown (fig. 2). 



the field was approximately 

 A sketch of the form of appa- 

 The iron surface consisted of 



