AT VAN RENSSELAER HARBOR. 



23 



G<ittin,2:en 

 mean time. 



Om. 



06m. 



12m. 



18m. 



24m. 



30m. 



36m. 



42m. 



48m. 



64m. 



Fern Rock 



mean time. 



(to Om.) 



Fern Rock Observatory, May 26 and 27, 1854. 

 Readings taken 1"" 34* earlier than indicated. 



11 

 12 

 13 



14 



15 



16 



It 



18 



19 



20 



21 



22 



23 







1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



4''37"'.5 



5 " 



6 " 



7 " 



8 " 



9 " 



10 " 



11 " 



12 " 



13 " 



14 " 



15 " 



16 " 



17 " 



18 " 



19 " 



20 " 



21 " 



22 " 



23 " 



" 



1 " 



2 " 



3 " 



4 " 



Observations commence at g"" 24"°, scale readings 280*, 271*, 266*, 235*, 231*, 240*, corre- 

 sponding to 9^ 24"', 30'", 36", 42", 48", and 54" respectively. 



Fern Rook Observatory, June 21 and 22, 1854. 

 Readings taken 1"34' earlier than indicated. (Magnet suspended, I. 7.)' 



lOii 



11 



12 



13 



14 



15 



16 



17 



18 



19 



20 



21 



22 



23 







1 



2 



3 



4 



5 



6 



7 



8 



9 

 10 

 11 



4''37".5 



5 " 



6 " 



7 " 



8 " 



9 " 



10 " 



11 " 



12 " 



13 " 



14 " 



15 " 



16 " 



17 " 



18 " 



19 " 



20 " 

 21 



22 " 



23 " 



" 



1 " 



2 " 



3 " 



4 " 



5 " 



Value of a division of the scale 0'.80. 



Increase of scale readings denotes a movement of the north end of the magnet to the east. 



' This magnet I. 7 was undoubtedly used on all previous occasions. Murk reads on circle 338° 22', 

 circle reads 314° 12'. 



