NEWTONIAN CONSTANT OF GRAVITATION. 53 








Position. 
Time. 
Neutral. Positive. | Negative. 
| 
heen: | 
12 3Y 22649-9 
| 12° 46 20797°3 
13 0 244.92°9 
13 15 | 20795°5 
13 30 24491°3 
| 3 7133 20795:1 
(ee clseesz 244925 
| Oscillation of large amplitude for period. 
ey 2 | 20793°7 
15 15 | 24.4.92°2 
iby AL yn) | | 20795°2 
15 42 | 244.90-2 

The deflections P are obtained by taking these in groups of consecutive threes, to 
allow as far as possible for steady creeping of the zero. It will be seen that in the 
present instances there is nothing very definite that can be attributed to this. 
The four deflections obtained in this way before the time interval are— 
3696°5 
3696°6 
3696°0 
3690°8 
The two after are— 
(3697°7) 
369670. 
As the mean point of rest 20793°7 was taken immediately after the oscillations of 
large amplitude produced by the air draught and was definitely slightly disturbed, 
I have not included the resulting deflection 3697°7 in the series from which the true 
deflection on that particular night was determined. The agreement is exceedingly 
close, so that the mean of the five values P = 3696°4 may be taken with considerable 
confidence. 
The observations on this night were rather more consistent than usual, owing, as I 
believe, to the very unusual quiet noticed at the time. 
I only took one observation of period on this night, recorded as follows :— 
