Observations of Magnetic Dip, April 21 — August 7. 1843. 







Needle. 



Face of Circle E. 



Pace of Ciecle W. 















ttin^GD 



Dura- 

 tion 

 of 

 Obser- 











Mean. 



A. dipping 



Minus 



B. dipping. 



Observed 

 Dip. 





m Time, 

 ddle of 

 31' vat ion. 



Num- 

 ber. 



Tem- 

 pera- 



End 

 dip- 



Marl£ on Needle 



Mark or 



I Needle 





vation. 





ture. 



ping. 



E. 



W. 



E. 



W. 













o 



d. li. m. 



m. 





o 





o 



o 



o 



o 







, 



, 



o 



, 





21 3 10 



48 





57 



{I 



73 6 

 70 4 



5 

 



69 46-0 

 73 27-0 



72 37 

 69 44 



5 

 



69 14-5 

 73 3-5 



71 



71 



11-12) 

 34-62/ 



+ 23-50 



71 



22-87 



W 



24 23 0) 



25 3 0/ 







47 



{b 



70 1 

 73 20 





 



73 300 

 69 16-0 



69 41 

 72 51 





 



73 12-5 

 68 59-0 



71 

 71 



36-121 

 6-50/ 



-f- 29-62 



71 



21-31 



B 



1 







... 



{a 



73 35 

 70 1 



5 

 



69 19-0 

 73 38-0 



72 52 

 69 29 





 



68 40-5 

 73 140 



71 

 71 



6-75) 

 35-50/ 



+ 28-75 



71 



21-12* 



B 



5 3 25 



45 





53 



{b 



70 9 

 73 22 





 5 



73 41-0 

 69 31-5 



69 28 

 72 35 





 



73 12-5 

 69 11-0 



71 

 71 



37-62) 

 10-00/ 



+ 27-62 



71 



23-81 



W 



15 22 45 



53 





48 



{I 



73 28 

 70 8 



5 

 5 



69 33-5 

 73 36-5 



72 36 

 69 34 



5 

 



68 54-0 

 73 13-5 



71 

 71 



8-12) 

 38-12/ 



+ 30-00 



71 



23-12 



W 



20 3 



... 





51 



Ib 



70 8 

 73 16 





 5 



73 33-5 

 69 32-0 



69 33 



72 36 





 5 



73 7-5 

 69 15-0 



71 

 71 



35-50) 

 10-OOj 



+ 25-50 



71 



22-75 



W 



26 3 25 



40 





58 



{I 



73 17 

 70 13 



5 

 5 



69 37-0 

 73 28-0 



72 40 

 69 39 





 



69 5-5 

 73 0-5 



71 



71 



10-00| 

 35-251 



+ 25-25 



71 



22-62* 



B 



JO 23 15 



60 





48 



{^ 



70 9 

 73 21 



5 

 



73 27-5 

 69 20-0 



69 38 



72 50 





 



73 6-5 

 69 1-0 



71 

 71 



35-37i 

 8-00/ 



+ 27-37 



71 



21-69* 



W 



2 3 40 



55 





56 



{i 



73 30 

 70 11 



5 

 



69 130 

 73 26-5 



72 57 

 69 41 





 5 



68 56-5 

 73 9-0 



71 

 71 



9-25) 

 37-00/ 



+ 27-75 



71 



23-12 



W 



5 22 35 



40 





48 



{^ 



70 13 

 73 22 





 



73 30-0 

 69 34-0 



69 46 



72 47 





 5 



73 7-5 



69 8-0 



71 

 71 



39-12) 



12-87J 



+ 26-25 



71 



26-OOt 



B 



9 3 40 



52 





56 



{i 



73 29 

 70 4 



5 







69 26-0 

 73 30-0 



72 56 

 69 44 





 



69 9-5 

 73 18-5 



71 

 71 



15-25) 

 39-12/ 



+ 23-87 



71 



27-19t 



W 



9 23 30 



60 





... 



{t 



70 13 

 73 46 



5 







73 29-0 

 69 25-0 



69 41 



72 36 



5 

 5 



73 6-5 

 68 34-0 



71 

 71 



37-62) 

 5-37} 



+ 32-25 



71 



21-50t 



w 



2 22 50 



... 





... 



)A 



73 46 

 70 6 



5 







69 24-5 

 73 43-5 



72 44 

 69 32 



5 

 5 



68 33-5 

 73 12-5 



71 

 71 



7-25) 

 38-62/ 



+ 31-37 



71 



22-94* 



w 



6 3 50 



52 





76 



/A 



70 5 

 73 46 



5 

 



73 39-5 

 69 21-5 



69 31 

 72 37 



5 

 5 



73 16-0 

 68 38-0 



71 

 71 



38-12) 



5-75 f 



+ 32-37 



71 



21-94 



w 



9 22 35 



18 





63 



B 



73 51 







69 24-5 



72 48 



5 



68 34-5 



71 



9-62) 

 38-00 ( 



+ 28-38 



71 



23-81* 



B 



20 



20 





70 



A 



70 8 



5 



73 18-0 



69 44 



5 



73 21-0 



71 



3 7 10 



40 





74 



ii 



70 4 

 73 55 



5 

 



73 34-0 

 69 20-0 



69 39 



72 39 



5 

 5 



73 13-5 

 68 39-5 



71 

 71 



37-87i 

 8-50/ 



+ 29-37 



71 



23-19* 



B 



6 22 55 



50 





58 



{I 



73 48 

 70 12 





 5 



69 26-Ot 

 73 32-0 



72 43 

 69 37 



5 

 



68 39-5 

 73 14-5 



71 

 71 



9-25) 

 39-00) 



+ 29-75 



71 



24-12 



W 



30 4 







64? 



{t 



70 8 

 74 38 



5 

 



73 32-0 

 68 29-5 



69 40 

 73 20 





 



73 18-5 

 67 56-Ot 



71 

 71 



39-75) 



5-87/ 



+ 33-88 



71 



22-81 



W 



' 3 23 30 



70 





67 



(B 



(A 



74 50 

 70 4 





 5 



68 31-0 

 73 36-0 



73 43 

 69 31 



5 

 



67 32-0 

 73 190 



71 



71 



9-12) 

 37-62/ 



+ 28-50 



71 



23-37t 



B 



>■ ) 23 10 



60 





70 



/A 

 IB 



70 2 

 74 6 



5 







73 42-0 

 69 8-5 



69 35 

 72 54 





 5 



73 23-5 

 68 36-5 



71 

 71 



40-75) 

 11-37/ 



+ 29-38 



71 



26-06 



W 



- I 3 45 



52 





74 



{I 



74 6 

 69 48 





 



69 5-0 

 73 58-0 



72 57 

 69 22 





 5 



68 28-5 

 73 44-0 



71 

 71 



9-12) 

 43-12f 



+ 34-00 



71 



26-12 



W 



8 



45 





67 



it 



69 46 

 73 43 





 5 



74 7-5 

 69 23-0 



69 19 



72 59 





 



74 27-5 

 68 41-0 



71 

 71 



55-Ooi 

 11-62/ 



+ 43-38 



71 



33-3 It 



B 



) 35 



50 





70? 



{I 



73 56 

 69 58 



5 

 



69 21-5 

 73 36-5 



72 47 

 69 18 





 



68 51-0 

 73 51-5 



71 

 71 



14-001 

 41-OOj 



+ 27-00 



71 



27-50 



W 



' 2 10 



60 





66 



{t 



69 54 



74 



5 







73 51-0 

 69 32-0 



69 11 



72 46 



5 

 



73 53-0 

 68 51-0 



71 

 71 



42-50i 

 17-25/ 



+ 25-25 



71 



29-87t 



B 



:. 3 50 

 I 



... 





... 



{I 



73 49 

 69 40 



5 

 



69 32-5 

 74 6-0 



72 46 

 68 59 



5 

 5 



68 51-0 

 74 4-5 ? 



71 

 71 



14-87) 

 42-50/ 



+ 27-63 



71 



28-69 



W 



i ' ' 



180 





62 



{t 



69 18 

 73 5 



5 

 5 



74 10-0 

 69 37-0 



69 9 

 73 4 





 



74 10-5 

 69 25-0 



71 

 71 



42-00) 



17-87/ 



+ 24-13 



71 



29-94t 



B 



1 3 40 



55 





74 



{I 



73 11 



68 58 



5 

 5 



69 27-0 

 74 12-0 



72 34 

 68 55 





 



69 22-5 

 74 130 



71 

 71 



8-75) 

 34-62/ 



+ 25-87 



71 



21-69* 



W 



■ 



- 23 



60 





65 



\t 



68 48 

 73 39 





 



74 17-0 

 69 5-5 



68 53 

 73 4 



5 

 5 



74 14-5 

 69 3-5 



71 

 71 



33-25) 

 13-12/ 



+ 20-13 



71 



23-19 



W 



1 



* Observations considerec 



1 good. 



T Obser 



vations consic 



lered 



bad or doubtful. 









* aOd. Th 



e Dip instrument was removed 



from the Magnetic Obser 



ifatory to the 



wooden hous 



e erected for it and the e. 



stra declinomel 



er. 



'lee Tntrod 



uction. 



















.51— Sep 



t. 12. Tlie Dip instrument dur 



ing this period worked in 



perfectly, eh 



iefly in liftinj 



5 the needle. See Introduc 



tion for details 





iC AND MET. OBS. 1843. 



