xl 



Inteoduction to the Makeestoun Obseevations, 1843. 



Table 13 — continued. 



Gottingen 

 Mean Time. 



Arc at 

 commence- 

 ment. 



Number 



of 



vibrations. 



Time of 



one 



vibration. 



Tempera- 

 ture 

 of Needle. 



Gottingen 

 Mean Time. 



Arc at 

 commence- 

 ment. 



Number 



of 



vibrations. 



Time of 



one 



vibration. 



Tempera- 

 ture 

 of Needle. 



d. h. 



Oct. 9 2 



60 



30 



10-50 



49-9 



Dec. 



d. h. 



1 3 



30 



40 



10-02 



40-7 



Oct. 18 3 



7-5 



30 



10-55 



43-3 



Dec. 



1 22 



5-0 



30 



9-70 



35-8 



Oct. 25 2 



2-7 



25 



10-20 



43-2 



Dec. 



3 22 



4-2 



40 



9-90 



47-2 



Nov. 2 3 



7-0 



25 



10-30 



41-0 



Dec. 



4 22 



5-0 



30 



10-01 



48-2 



Nov. 2 22 



60 



30 



10-36 



38-3 



Dec. 



6 22 



3-5 



40 



9-74 



45-0 



Nov. 8 20 



4-5 



30 



10-34 



36-2 



Dec. 



7 22 



3-8 



40 



10-04 



46-5 



Nov. 12 20 



4-5 



30 



10-40* 



41-6 



Dec. 



8 22 



3-2 



40 



9-97 



46-1 













Dec. 



10 22 



3-6 



40 



9-90 



46-6 













Nov. 13 22 



3-0 



20 



11-20 



39-5 



Dec. 



11 22 



4-0 



30 



9-96 



47-4 



Nov. 14 22 



2-0 



12 



11-25 



38-8 



Dec. 



12 22 



3-8 



30 



9-85 



47-3 



Nov. 16 22 



50 



20 



10-88 



42-8 



Dec. 



13 22 



3-7 



40 



9-78 



47-5 



Nov. 17 22 



3-5 



20 



10-88 



40-6 



Dec. 



14 22 



4-2 



15 



9-79 



49-9 



Nov. 19 22 



50 



30 



10-64 



41-6 



Dec. 



15 22 



4-1 



30 



9-87 



430 



Nov. 21 



4-5 



30 



10-67 



42-5 



Dec. 



17 22 



37 



40 



9-69 



45-4 



Nov. 21 23 



40 



40 



10-58 



46-0 



Dec. 



18 22 



3-6 



40 



9-75 



44-6 



Nov. 23 



3-3 



30 



10-47 



39-1 



Dec. 



19 22 



4-4 



40 



9-61 



45-2 



Nov. 23 23 



4-0 



30 



10-62 



35-5 



Dec. 



22 1 



4-2 



30 



9-99 



49-2 



Nov. 24 



4-0 



15 



10-55 



36-0 



Dec. 



22 22 



4-4 



15 



9-74 



49-5 



Nov. 26 22 



4-0 



15 



10-06 



49-0 



Dec. 



24 22 



3-8 



30 



9-73 



49-5 



Nov. 27 3 



1-8 



30 



10-02 



500 



Dec. 



25 22 



4-0 



30 



9-72 



47-8 



Nov. 27 22 



3-6 



30 



10-03 



48-5 



Dec. 



26 22 



3-3 



30 



9-57 



46-5 



Nov. 28 22 



3-8 



30 



10-02 



46-4 



Dec. 



27 22 



3-7 



30 



9-55 



44-4 



Nov, 29 22 



40 



30 



1005 



40-4 



Dec. 



28 22 



3-9 



30 



9-47 



45-7 



Nov. 30 22 



4-0 



15 



10-27 



41-5 



Dec. 



29 22 



3-7 



40 



9-49 



46-3 



b5. The following are the mean values of T, and the consequent values of k. 



T = 12^-0, 6 = n° W:— 



Jan. —Aug. 23. T = 952 



Aug. 24— Sept. 1. T = 10-40 



Sept. 5— Nov. 13. T = 1065 



Nov. 13— Dec. T = 1007 



k = 00000158, approximately k = 000015 

 k = 0-0000133, approximately k = 0000014 

 k = 0-0000126, approximately k = 000013 

 k = 0-0000141, approximately k = 0000014 



The approximate values of k are those given at the foot of each page of the 

 Magnetical Observations. It will be observed that all of these values differ very 

 considerably from that obtained, No. 51, which was adopted in the reductions for 

 the Abstracts, after the above values of k were printed in the notes to the Magneti- 

 cal Observations. 



56. Adjustments. 



August 23. 1843. The balance needle was removed for the purpose of deter- 

 mining its temperature coefficient ; the needle was placed in a small copper trough 

 with a glazed lid, which trough was surrounded by water, contained in a larger 

 trough. 



* Aug. 23 and 31, and Nov. 12. See note on preceding page. 



