INTRODUCTION. 
TABLE 16—continued. 
XXXVi1 
Time of one Vibration. 
Number Adopted 
Date. of Ronee 
Vibrations.) Observed. Adopted. 
d. h. s 8 Ss. 
1842. 
Aug. 2 8 30 10-42 10-40 
Aug. 13 8 40 10-44 10-42 
Sept. 7 23 || 20 10-52 
Sept 7 23 10 10-47 10-45 
Sept. 7.23 20 10-54 
Sept. 24 5 40 10-55 10-44 
Oct. 8 2 30 10-39 
Oct. 8 2 20 oa 10-30 
Oct: 8 2 20 10-36 
Oct. 31 2 10 10-07 
Oct. 31 2 30 10-19 
Oct. 31 2] 20 ia 2:88 
Oct. 31 2 10 9-96 
Nov. 10 20 20 meh 10-33 
Nov. 10 20 20 10-35 
Nov. 18 23 20 i 10-00 
Nov. 18 23 10 9-96 10.0 
Dec. 8 3 20 ena 9.98 
Dec. 8 3 20 10-04 
Dec. 20 2 20 10-05 
Dec. 20 2 10 10-03 10-02 
Dec. 20 2 10 9.98) 
Dec. 31 2 10 9-75 
Dec. 31 2 10 9-84 9-77 
Dec. 31 2 20 9-84 
Remarks, 
Noy. 10¢ 64. Needle vibrated accidentally 
by steel compasses. 
The adopted time of vibration has been obtained from the last observations in 
each series, and differs slightly from the observed time of the whole series. 
TABLE 17.—Effect of the Bifilar. and Declination Magnets on the Balance Magnet. 
Declination. 
North End of 
Magnet. 
Second Series. 
First Series. 
eines Effect of Magnet. Tata 
STEN | MeMETES | pecluatiin: | Bidlan, 
Mic. Div. Mie. Div. Mic. Div. Mic. Diy. 
W. — 188-0 + 231-8 
W. — 188-3 0-2. +231-8 
W. — 187-7 + 232-1 
E. — 183-5 3-4 + 234-2 
W. — 186-1 + 233-0 
Reading. 
ee Declination, | Bifilar. 
Effect of Magnet. 
Mic. Div. 
Mic. Diy. 
0-1 
1:7 
The position of the Balance Needle was altered for the second series of obser- 
vations. 
43. Observations and reductions. 
MAG. AND MET. OBS. VOL. I. , 
k 
