MAGNETIC SURVEY OF PENNSYLVANIA. 

 Philadelphia.— July 20, 1841. Lat. 39° 58'.4; long. 750 10' 0. 



u\ 



Abstract of Declination Observatione 



N. end. 



1 40. 9 E. 



2 03.2 E. 



31.8 E. 

 13.1 E. 



—1 0T.3 



B. • ml. 



1 48.2 E. 



I ci.i E. 



3 ln.i E. 



3 13.5 E. 



+ 2 30.3 



= + 0" 10' I 

 218 52.9 



8 h 34 m 52 s . 7 

 224° 33' 25" 



+ 41.5 



Azimuth circle reads, 



Magnetic meridian reads, 219 03.0 



Abstract of Observations for Azimuth of Polaris. 

 Mean of times 

 Mean circle reading . 



July 20, chron. fast . 



Chron. time of observation 

 Mean " " 



Corresponding sid. time 



R. A. of Polaris 



Hour angle . 



Azimuth of Polaris . 

 Reading of Polaris . 



" ast. meridian 



" magnetic meridian 



Magnetic Declination W. 



h 00 m 13 s . 2 



8 34 52.1 



8 34 39.5 



16 29 16.8 



1 02 37.2 



15 26 39.6 



1° 33'. 3 

 224 33.4 

 223 00. 1 

 219 03.0 



3 57.1 



Easton.— July 23, 1841. Lat. 40° 42'; long. 75° 15'. 

 Abstract of Declination Observations. 



N. end. 



30.0 W. 

 22. 1 W. 

 28.4 W. 

 02.4 W. 



+ 20.7 



S. end. 



1 15.7 W. 

 1 l!.s W. 

 1 22.7 W. 

 1 36.4 W. 



— 1 22.4 



—0 30.8 



Azimuth circle reads, 



—0° 07'.5 

 332 51.9 



Magnetic meridian reads, 332 44.4 

 Abstract of Observations for Azimuth of Polaris. 



Mean of times 

 Mean circle reading . 



July 23, chron. fast . 

 Chron. time of observation 

 Mean " " 



Corresponding sid. time 

 R, A. of Polaris 

 Hour angle . 



s' 1 ;,:; ' n.V ,, 

 338 05' 41" 



0" 00 m 34". 8 

 8 . r >:; 05 

 8 52 30.2 



16 58 59.3 

 1 (i2 39 5 



15 56 19.8 



