86 H. A. Rowland—Magnetic Effect of Electric Convection. 
Deflection on 
Direction of | Electrifica- [Scale reading; reversing Length of 
motion. tion of disc. in mm, electrifcat'n spark. 
99- 
+ + 1075 7°25 "295 
_ 101°5 
68°5 
se — 165 8°25 290 
= 68-0 
® + 97 
+ a 91°5 7-00 282 
- 100: 
ne 59° 
pa _ 65°5 6°75 265 
. a 58°5 
+ 92°65 
ee _ 85° 6°75 290 
- 91-0 
+ 52°5 
ee a 57-5 5°50 285 
_ 515 
+ 82°0 
+ _ 760 5°85 285 
+ 81-7 
+ 36°5 
ces —_ 43°0 6°50 275 
55 36°5 
+ 68°0 
re as 61-0 7-00 290 
1 68-0 
+ 27°5 
= 33°5 6°50 “288 
~ 26°5 
Mean values. | 6435 | 2845 
"6735 
Hence, 4=—,- ='337 and /=°2845. 
From equation (1), 
X—99 X’= nee =00000327. 
~~ 305700" 
By calculation from the aoe oe we find 
—-99 X’=—_—— = 00000337. 
xX—°99 —— ea: 0337. 
The effect on the upper needle, X’, was about ;', of that on 
. 
the lower 
Second 3 Everything the same as before except the 
following. b=7°65, n’=0525. 
