12 



MAGNETIC OBSERVATIONS MADE AT PANAMA. 



Observations for Magnetic Inclination. 



Needle C. — Station, Panama, Isthmus of Darien, New Grenada. Instrument, Fox magnetic circle, made 

 by W. George. Observer, A. W. Whipple. Latitude, 8° 57' 12" north. Longitude, 79° 29 24 .5 west 

 of Greenwich = 5" H""- 57" .63. Date, March 28ih, 1849. Weather, clear. 



Poles direct. 



Poles reversed. 



Face of Circle East. 



Face of Circle West. 



Mean Solar 



TimeofOb- 

 servalioD. 



gh. 15m. 



gh. 24m. 



Thermom- 

 eter. 



81 



Change of 

 Brackets. 



1 

 2 

 3 



Reading of North Reading of South 

 End of Needle. End of Needle. 



32 05 



32 00 

 32 00 



32 00 



32 00 

 32 00 



Mean Solar 

 TimeofOb- 

 servation. 



glL 15m. 



6h. 24m. 



Thermom- 

 eter. 



81 



Change of 

 Brackets. 



1 

 2 

 3 



Eleading of North Reading of South 

 End of Needle. End of Needle, 



32 15 

 32 25 

 30 07 



32 15 



32 28 

 32 07 



Mean with Poles Reversed, 



32 08 



Final result with needle C, poles direct and reversed, 32° 00 .25. 



Needle B. — Station, Panama, northwest bastion of the city wall. Instrument, Fox magnetic circle, made 

 by W. George. Observer, A. W. Whipple. Latitude, 8° 57' 12". Longitude, 79° 29' 24".5 = 

 gb. j.yra. 57» g3 Pace of Instrument, north, needle perpendicular, reading of azimuth circle, 11° 05'.5 ; 



11° 03'.5 ; 11° 05'. Face of instrument, south, needle perpendicular, reading of azimuth circle, 11° 06'.5; 

 11° 06'.5; 11° 06.5. Reading of azimuth circle, when the vertical circle was in the magnetic meridian, 

 11° 05'. 5. Da<e, April 2d, 1849. TFea^Aer, clear. 



Mean result for dip of needle B, 31° 54'.2. 



