548 



APPENDIX. 



[No. II. 





APRIL, 



1820. 







MAY. 



Days. 



8 A. M. 



iP. 



M. 



4 P. M. 



12 P. M. 



Days. 



8 A.M. 



1 P. M. 



4P-M. 



12 P. M. 



1 



















o 





o 





O 



i 



o 



















1 



17 



16 



17 



8 



17 



9 



17 



0* 



2 



Q 

















2 



17 



34* 



17 



9 



17 



10 



16 



52* 



O 

















3 



17 



17 



17 



8 



17 



9 



17 



14 



4 

















4 



17 



16 



17 



8 



17 



8 



17 



14 



K 

 *J 

















5 



17 



16 



17 



7 



17 



7 



17 



14 



6 

















6 



17 



16 



17 



7 



17 



7 



17 



14 



7 

















7 



17 



15 



17 



7 



17 



7 



17 



15 



8 

















8 



17 



17 



17 



8 



17 



8 



17 



15 



9 

















9 



17 



17 



17 



8 



17 



8 



17 



15 



10 

















10 



17 



IS 



17 



9 



17 



9 



17 



16 



11 

















11 



17 



17 



17 



8 



17 



8 



17 



15 



12 



O / 



o 



i 



o 



i 



o 





12 



17 



18 



17 



8 



17 



8 



17 



15 



13 



17 14 



17 



9 



17 



10 







13 



17 



16 



17 



8 



17 



8 



17 



16 



14 



17 13 



17 



8 



17 



8 



17 



11 



14 



17 



18 



17 



8 



17 



8 



17 



15 



15 



17 15 



17 



8 



17 



10 



17 



14 



15 



17 



18 



17 



S 



17 



8 



17 



16 



1 6 



17 15 



17 



9 



17 



11 



17 



14 



16 



17 



18 



17 



8 



17 



8 



17 



15 



17 



17 16 



17 



9 



17 



11 



17 



16 



17 



17 



17 



17 



9 



17 



9 



17 



15 



18 



17 1 / 



1 7 



9 



17 



11 



17 



15 



18 



17 



17 



17 



9 



17 



9 



17 



14 



19 



17 16 



17 



10 



17 



12 



17 



28* 



19 



17 



17 



17 



8 



17 



9 



17 



16 



20 



17 16 



17 



9 



17 



11 



17 



1* 



20 



17 



18 



17 



8 



17 



8 



17 



15 



21 



17 16 



17 



10 



17 



8 



17 



10 



21 



17 



17 



17 



8 



17 



8 



17 



15 



22 



17 16 



17 



9 



17 



11 



17 



15 



22 



17 



18 



17 



8 



17 



8 



17 



16 



23 



17 23 



17 



8 



17 



9 



17 



14 



23 



17 



19 



17 



9 



17 



10 



17 



33* 



24 



17 17 



17 



9 



17 



10 



17 



15 



24 



17 



25* 



17 



8 



17 



9 



17 



14 



25 



17 17 



17 



10 



17 



12 



17 



m 



25 



17 



17 



17 



7 



17 



7 



17 



13 



26 



17 16 



17 



9 



17 



9 



17 



14 



26 



17 



16 



17 



7 



17 



7 



17 



14 



27 



17 16 



17 



9 



17 



7 



17 



13 



27 



17 



17 



17 



7 



17 



7 



17 



14 



28 



17 16 



17 



8 



17 



9 



17 



14 



28 



17 



17 



17 



7 



17 



8 



16 



54* 



29 



17 16 



17 



8 



17 



8 



17 



14 



29 



17 



16 



17 



7 



17 



8 



17 



14 



30 



17 15 



17 



7 



17 



7 



17 



14 



30 



17 



17 



17 



7 



17 



7 



17 



14 



















31 



17 



16 



17 



7 



17 



7 



17 



15 



* Where the figures are marked with an asterisk, the Aurora had approached, or passed, 

 the zenith, and was doubtless the cause of the increased or diminished variation. The varia- 

 tion assumed for the 12th of February, is, that which was observed by Mr. Franklin in No- 

 vember, the coldness of the weather not afterwards permitting- the use of instruments, until 

 the month of February. It may be remarked, that the greatest variation was found between 

 8 and 9 A. M., and the least at 1 P.M. The needle was nearly stationary during- the heat of 

 the day ; and the variation, then, gradually increased until the 'next morning-. If the needle 

 had not been affected by the Aurora, and by some unavoidable unsteadiness, the variations 

 would probably have been much more regular. The most striking circumstance in these ob- 

 servations is, that though the needle varies, and is stationary, at the same hours here, in 

 London, and at Sumatra, the laws which govern it are exactly reversed ; the variation 

 here being greatest at the coldest period, instead of least ; and vice versa. For this pheno- 

 menon, it is not, perhaps, difficult to account on Dr. Lorimer's principles. 



The annual variation seems to be inconsiderable. 



The variations of the dipping needle were, also, observed ; but they differed very unac- 

 countably. The amount varied from 10' to 25' ; and the dip was generally least in the 

 morning, and greatest at 3 P.M. 



