xliv 



Inteoduction. 



Table 20 — continued. 



Gottingen 

 Mean Time. 



Tempe- 

 rature of 

 Balance 

 IMagnct. 



«-«o- 



Reading 



of 

 Unifilar. 



Reading 

 of Declino- 

 meter 

 reduced 

 = rd. 



minus 



r{d-d^). 



Bifilar. 



~q- 



Reading 

 corrected. 



Thermo- 

 meter. 



A. Ii. m. 



Jan. 27 3 2 

 3 21 

 3 40 



3 58 



4 13 

 4 31 



4 49 



5 4 

 5 20 

 5 31 



38-95 

 63-70 

 36-35 

 68-55 

 38-25 

 62-55 

 35-85 

 65-25 

 35-90 

 Magnet 



24-75 

 27-35 

 32-20 

 30-30 

 24-30 

 26-70 

 29-40 

 29-35 



Away. 



Sc. T)ir. 



16-96 

 18-05 

 17-96 

 19-14 

 18-66 

 18-89 

 18-60 

 19-46 

 19-11 

 265-82 



,Sc. Div. 



159-27 

 159-90 

 160-12 

 160-87 

 160-96 

 160-65 

 160-89 

 161-11 

 161-16 

 160-84 



.Sc.Div. 



-0-46 

 -0-31 

 -0-43 

 -0-57 

 -0-54 

 -0-53 

 -0-64 

 -0 40 



Sc. Div. 



190-35 



190-12 



190-47 



188-42 



186-50 



187-44 



188-42 



186-82 



189-01 



45-3 

 45-5 

 45-6 

 45-6 

 45-7 

 45-8 

 45-9 

 45-9 

 45-9 



- 00000766 

 -00000480 

 -0-0000625 

 -0-0000681 

 -0-0000851 

 -0-0000853 

 -0-0000954 

 -0-0000650 



50. The means of the partial results on the different days were given weights 

 depending on the formula, 



.^ . , , _ Number of partial results 



Mean of the squares of the partial results minus the square of the mean 



Aug. 23d— 24'i 1843. 



Aug. 31"— Sept. l<i ... 



Sept. l^i— 2" 



Nov. 12''— 13'^ 



Jan. 27-1 1844. 



Weight = 49 



Mean of the partial results g = 0000845 



7 = 00000768 = 79 



7 = 00000792 = 425 



7 = 00000620 = 320 



7 = 00000729 = 1157 



Whence the resulting value, 



7 = 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, I 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 q = 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 q = 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 9 = 7*90 Mic. div. has been applied in the abstracts of the observations. 



