YERDET’S CONSTANT IN ABSOLUTE UNITS. 19 
Set 1. February 25. — 11 to 11.30 p.m. Green light ^=(5 - 349)10 -5 centims. 7 cells. 
Plane of polarization. 
Scale-readings. 
Corrected deflections. 
No current. 
25-45 
Current direct. 
266 12 0 
266 12 0 
*266 17 0 
3-71 
21*63 centims. 
266 16 0 
Mean 266 14 15f 
Current reversed. 
281 35 0 
281 36 0 
281 44 0 
46-82 
21-42 centims. 
281 46 0 
Mean 281 40 15 
2R=15° 26' 0" a=102-5 centims. 
.r=meaii of deflections=21’525 centims. 
2 ^=8917'-5 y=tani=i?-i.3=-10S84 
Set 2. February 25. — 11.30 to 12 p.m. Same light. 5 cells. 
Plane of polarization. 
Scale-readings. 
Corrected deflections. 
No current. 
25-58 
Current direct. 
268 6 0 
268 5 0 
268 11 0 
8-58 
16-97 I 
268 6 0 
Mean 267 7 0 
Current reversed. 
280 11 0 
280 9 0 
280 1 0 
42-06 
16-50 
280 1 0 
Mean 280 5 30 
211=11° 58' 30" a= 102-5 centims. 
^=16’735 centims. 
— =8861'-1 ^=-081090 
y u 
'* With regard to the differences between different determinations of the plane of polarization, it must he 
remembered that it is impossible to keep the battery- current absolutely constant during a series of experiments 
extending over 10 or 12 minutes. f The seconds only appear in the means. 
D 
O 
