62 MAGNETIC INTENSITY, FERN ROCK OBSERVATORY. 



Abstkact of Observations of Vibrations at Hakluyt Island. 



Approx. lat. tt° 23'. Approx. long. t2° 30' W. of Gr. 



1855. June 21. 33°.3 t«.020 ) 



" 21. 33.3 t.026 >• t».026 



" 21. 33.8 t.033 ) 



33°.5 



Abstract of Observations of Vibrations at a station in lat. t6° 03' and long. 68° 00' W. op 

 Gr., on the coast between Parker Snow's Point and Cape York. 



1855. July 19. 40°.0 6».4t5~ 



" 19. 41.5 6.489 



" 19. 41.2 6.544 



" 19. 39.5 6.4t4 



6».495 



40°.5 



Determination of the Moment of Inertia of Magnet A. 6t. 

 (With stirrup and mirror attached.) 



No determination of the moment of inertia of magnet A. 67 having been made 

 by the expedition, it became necessary to determine the same afterwards. The 

 following observations for this purpose were made by myself at the Coast Survey 

 Office, Washington, D. C. 



