32 



M A G N B T I C SU R V E Y OF P E N N S Y L V A X I A. 



Azimuth of Polaris . 



Reading of Polaris . 

 " ast. meridian 



" magnetic meridian 



Magnetic declination W. 



1° 4:;'.:; 

 338 05.7 

 336 22.4 

 332 44.4 



3 38.0 



Williamsport.— July 28, 1841. Lat. 41- H'.O; long. 77° 03'.5. 



Abstract of Declination Observations. 



B, end 



21.9 W. 



1 02. 6 W. 



N. end. 



54.(1 W. 



1 01.8 W. 

 1 31.6 W. 

 1 3G.7 \V. 



+ 1 16.2 



15.0 W. 

 18.7 W. 



— 29.6 



+ 23.3 = +0° 05'. 6 



Azimuth circle reads, 241 22.2 



Magnetic meridian reads, 241 27.8 



Abstract of Observations on the Sun for time. 



Abstract of Observations on Polaris for Latitude. 



Set I. 



Cliron. time . 

 Observed double alt. 

 True altitude 

 Mean time . 

 ( lorresponding sid. time 

 It. A. of Polaris 

 Hour angle . 

 Latitude 



9 h 41 m 17 B .5 

 81° 39' 06" 

 40 48 23 

 9 h 33 m 23 s . 

 17 59 42.8 

 1 02 42.9 

 16 56 59.9 

 41° 14' 26" 



Set II. 



9 h 59 m 34 s . 7 

 81° 51' 50" 

 40 54 45 

 9" 51 m 40 s . 2 



18 18 03.0 

 1 02 42.9 



17 15 20.1 

 41° 13' 40" 



Mean, 



41° 14' 03" 



Abstract of Observations for Azimuth of Polaris. 



Mean of times ...... 8" 5 l m 11 s . 8 



Mean circle reading ...... 246° 46' 00" 



July 28, mean time of observation . . . . 8 h 43 m 17 s .3 



Corresponding Bid. time . - . . . 17 09 28.8 



Et. A of Polaris 1 02 42.9 



Hour angle . . . . . . . 16 06 45.9 



Azimuth of Polaris ...... 1° 47'.0 



Reading of Polaris ...... 246 46.0 



estron. meridian .... 244 59.0 



" magnetic meridian .... 241 27.8 



Magnetic Declination W. ... :i 31.2 



