122 } ya REPORT—1849. 

Fig. 3. Fig. 4. 
a EI 8 4 
= = = = 
4A4.M. 10 A.M. 10 P.M. 2 A.M, 3 4 A.M, 10 A.M. 10 P.M, 2 A.M, 
| a 
° 
F 
o 
FS 
-2 
1845, Mean. 
s 
= 
n 1845. Mean. 
= 
s 
os 
i= 
3 
=) 
= 
= 
Mean. & 
1846. se 
Par 
ae 
E 3 1846. Mean. 
so 
neo 
28 
33 
R= 
- 
s° 
1847. Mean. 2 
+ 18475 Mean. 
a 
aoe 
3S 
o 
a) 
o 
= 
~ 
— 
°o 
3 
Ez 
3 summers. Mean. 3 
a 
= . 
5 3 winters, Mean. 
Z 
a 
4 A.M, 10 A.M. 10P.M. 2A.M- 8 
E E : 
Ss S 
4 A.M. 10 A.M. 10 P.M. 2 A.M, 
a 3 
= a 
TABLE X. 
Number of positive readings at each observation-hour in the three winters of 
1845, 1846 and 1847. 
| Year. /Mia.l2 a.m.|4a.m.|6 a.m.8 a.m. 10 a.m. Noon. 2 p-m.|4 p.m.|6 p.m.'8 p.m./10 p.m./Sums. 
1845.| 87| 101 99 | 14 | 167} 160 | 140 | 151 | 153 | 152 | 144 | 161 | 1529 
1846. 94 | 108 | 114 | 18 | 178 | 168 | 146 | 143 | 148 | 143 | 138 | 169 | 1567 
1847.) 74) 107 | 126 9 | 175 | 175 | 146 | 146 | 148 | 149 | 143 | 168 | 1566 






Sums. 255 | 316 339 | 41 | 520] 503 432 | 440 449 | 444 | 495 | 498 | 4662 



Mean diurnal curves of the electrical tension for the winters of 1845, 1846 and 1847, with the mean curve of the three winters. 

tile the 
