AT VAN RENSSELAER HARBOR. 



26 



Determination of June 14. Magnet I. 10. Mirror facing magnetic north. 



Magnetic south meridian. 



I. 311° 10' 



at 5^ 12" Gr. t. 



09 



II. 317 02 



01 

 Means 338 06.5 



317 05.5 



Mean reading on mark 338° 06' 



Astronomical bearing (N.) 93 29 E. 



Reading of true meridian 

 Reading of magnetic meridian 



244 37 

 137 05 



Declination 107° 32' 



W. at 0'' 29" P. M. local time. 

 The magnet showed considerable agitation during the day. 



Determination of June 26. 



Magnetic south meridian. 



I. 315° 49' 

 47 

 n. 316 18 

 17 



Mirror facing magnetic north. 



Marie. 



I. 338° 24' 

 23 

 II. 338 20 

 19 



Means 316 02.7 

 at !>» 3" P. M. local time. 



338 21.5 



Magnetic south meridian. 



I. 315° 52' 

 50 

 II. 315 40 

 38 



315 45.0 

 at 2'' 0™ P. M. local time 



Mark reads 338° 21' 



Astronomical bearing (N.) 93 29 E. 



N. meridian (true) 

 Magnetic meridian 



244 52 

 135 53 



Declination 108° 59' 



W. at l^ 31" 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. 



