xliv INTRODUCTION. 
TABLE 20—continued. 
Reading F 
ve Tempe- Reading |of Declino- Bifilar. 
Gottingen rature of of eter 
Mean Time. Balance ’ |'Tnifilar.| reduced .| Reading |Thermo- 
| Magnet. —rd. corrected. | meter. 
. | Se. Se. Diy. Se. Se. Div. 3 
159-27 190-35 | 45-3 
159-90 : 190-12 | 45-5 
160-12 190-47 | 45-6 
160-87 i 188-42 | 45-6 
160-96 ‘ 186-50 | 45-7 
160-65 RS 187-44 | 45-8 
160-89 188-42 | 45-9 
161-11 186-82 | 45-9 
161-16 189-01 | 45-9 
160-84 
— 0-0000766 
— 0-0000480 
—0-0000625 
—0-0000681 
—0-0000851 
—0-0000853 
— 0-0000954 
—0-0000650 
3 
3 
3 
4 
4 
4 
5 
5 
5: 
50. The means of the partial results on the different days were given weights 
depending on the formula, 
Number of partial results 
(eet Mean of the squares of the partial results ménus the square of the mean 
Aug. 234—244 1843. Mean of the partial results g = 0:0000845 Weight= 49 
Aetie B1E Bethe va wicked, Oia Ae ce = 0:0000768 ......... = 79 
Sept. 14— 2a Wh teste ne ME Sel ee = 0:0000792 oo... = 425— 
Noy. 12*—134 be Sigh nice RARE dN melita q = 0:0000620 ......... = 320 
Jan. 274 NOAA nants AS pas ets Boos sdeme q = 00000729... = 1157 
Whence the resulting value, 
q = 0-000073. 
51. Having much doubt as to the accuracy and sufficiency of this method of 
determining the temperature correction, and feeling its insufficiency especially in the 
case of the balance magnet, where the time of vibration in a vertical plane is em- 
ployed, in whatever form the corrected observations be given, [attempted to deduce 
the temperature corrections from the usual daily observations in 1843 and 1844. 
For the methods adopted in deducing these results, I must refer to the paper 
cited, No. 44. 
It is enough to mention here the final results : 
For the bifilar magnet g = 0°000247 in parts of the whole horizontal force. 
This value has been used in correcting the Abstracts of Results at the end of this 
volume. 
For the balance magnet g = 7:90 micrometer divisions. 
As the observations for 1843 gave the same result for the balance magnet as 
those for 1844, independently of changes of adjustment and times of vibrations, the 
value of g = 7:90 Mic. div. has been applied in the abstracts of the observations. 
