M A G N E TIC ST R V E Y OF I' E N N S J I, V A MA. 



29 



Abstract of Observations for Azimuth of Polaris. 



Mean of times . 

 Mean circle reading 



Aug. IT, chron. fast . 

 Clirou. time of observation 

 Mean " " 



Corresponding sid. time 

 R. A. of Polaris 

 Honr angle 



Azimuth of Polaris 

 II cading of Polaris 



ast. meridian 

 " magnetic meridian 



Magnetic declination "W. 



Mean 



No. 5. Irwin's Mill, near Mercersburg.— Aug. 24, 1840. Lat. 39° 47' J long. TT° 56' 



Abstract of Declination Observations. 



N. end. 



1T.1 W. 



21.1 W. 



38.9 E. 



31.1 E. 



— 8.0 



S. end. 



21.5 E. 



12.4 E. 



34.2 E. 



31.2 B. 



+ 24.8 



+ 8.4 



Azimuth circle reads, 



+ 0° 02'. 

 323 19.9 



Magnetic meridian reads, 323 21.9 



Abstract of Observations for Azimuth of Polaris. 



Mean of times 

 Mean circle reading . 



Aug. 24, chron. fast . 

 Chron. time of observation 

 Mean " 



Corresponding sid. time 

 R. A. of Polaris 

 Ilour angle . 



Azimuth of Polaris . 



Reading of Polaris . 

 " ast. meridian 



" magnetic meridian 



Magnetic declination \\ r . 



l h 13 m S.V.i) 

 326° 13' 22" 



5" 

 1 



T 

 18 



1 

 IT 



13 11 



13 



59 



13 



02 



10 



39'. 8 

 35.0 

 55.2 

 24.3 

 38.9 

 45.4 



l°5T'.l 

 326 13.4 

 324 16.3 

 323 21.9 



54.4 



