AT VAN RENSSELAEll HARBOR. 



25 



Dok'niiiiiatioii of June 14. Magnet I. 10. Miri'or facing magnetic north. 



Murk. 



I. 338° 09' 



08 



II. 338 05 



04 



Means 338 0G.5 



Magnetic south meridian. 



I. 317° 10' 



at 5'i 12™ Gr. t. 

 09 

 II. 317 02 

 01 



317 05.5 



Mean reading on mark . 

 Astronomical bearing (N.) 



Reading of true meridian 

 Reading of magnetic meridian 



Declination .... 



244 37 

 137 05 



107° 32' 

 W. at Oh 29" P. M. local time. 



The magnet showed considerable agitation during the day. 



Determination of June 26. Mirror facing magnetic north. 



Astronomical bearing (N.) 93 29 E. 



N. meridian (true) 

 Magnetic meridian 



244 52 

 135 53 



Declination 108° 59' 



W. at 1^ SI-" P. M. 

 Resulting mean declination (for June 16) 108° 22' W. ; if we omit the 2d determination on account 

 of disturbance, and apply a correction for diurnal change to the mean of the first and last determination, 

 we find 108° 12' W. 



