of Steel Needle-Points in Air. 



287 



Table I. 



Needle A. 





Needle B. 







S/T. 







Vpt 







+ 



— 





+ 





d. 



Discharge. 



Discharge. 



d. 



Discharge. Discharge. 



V. 



1-35 





1-31 



1-27 



118 



206 







1-33 





1-19 



207 







1-29 





1-58 



28-6 







1-31 





1-60 



28-0 







1-28 





1-15 



20-4 







1-27 





1-17 



20-4 







126 





1-60 



281 







1-27 





1-59 



28-0 





1-62 





108 



1-18 



174 





1-65 







118 



18-0 





163 







1-61 



232 







1-26 





1-62 



23-5 







1-27 



0-76 



1-17 



12-4 







1-26 





114 



12-6 







1-26 





1-60 



173 





1-64 







1-59 



17-3 





1-64 





0-45 



1-61 



12-3 





1-63 







1-60 



11-8 





1-64 







115 



8-47 







1-28 





1-18 



8-89 







1-28 



0-28 



1-16 



710 







1-27 





112 



6-73 







1-29 





1-33 



9-08 



30 





1-27 





1-57 



951 







1-27 



0-15 



1-59 



7-18 







1-28 





1-59 



718 





1-64 







1-13 



5-36 





1-65 







1-15 



5-41 





1-65 





0-10 



113 



4-63 



5-0 



1-64 







1-17 



4-63 





1-66 







1-56 



6-05 





1-66 







1-59 



6-27 







127 



0-04 



1\>8 



5-14 







1-28 













1-30 













1-29 











, — 

















1-64 



1-28 





1-59 116 





discharge is more constant and stable than the negative, and 

 far less dependent on the condition of the discharging point. 



§ 3. One may, however, go further than simply showing 

 the constancy of the discharge field at the point. In terms 

 of the attraction of the needle and the radius of curvature of 

 the point, it is possible to calculate its value. 



