Dielectric  Strength  of  Air.  267 
Fig.  4. — Sparking-  Voltages  between  2  inch  spherical  electrodes. 
Points  marked  0  are  Steinmetz's  experimental  results. 
MLOVOLTS. 
130 
120 
100 
90 
60 
70 
60 
50 
40 
30 
20 
10 
0 
o        * 
/    \ 
c 
Y 
i 
0/ 
/ 
/ 
-p 
1 
1 
0  12  3  4  5  6 
//VCHES. 
