T. Mizuno on the Action of the Coherer. 

 Fig. 8. 



457' 





Ph 

















nn 













. 



IPO 



x 













un 



: 















mo 

















QO 









50 



, 







nn 





//ft 



A/ + Caomi 

 Fe^Cd 



40 



I //PC 





t(/M 





: t 



;: 





30 



w. 



J 



X 



m 







60 



1 





20 



S/L\ 



e/f + Wood 



J /KF73Z. 







A 



10 



\ 



^** R, S( MX j 



Ag'-^W 



i 











50 







20 10 



Number of Sparks. 



