26 MAGNETIC SURVEY OP PENNSYLVANIA. 



No. 1. Harrisburg.— Lat. 40° 16' ; long. 76° 53'. July 25, 1840. 



Declination Observations. 



NEEDLE DIRECT. 



Tel. direct. 



N. end. 



56 W 

 52 

 50 



52. 7 



58 E. 

 56 

 52 



55.3 



1.3 E. 



S. end. 



02 W 

 02 



58 

 56 

 54 



2 58.4 



32 E. 



35 



38 



42 

 44 



1 38.2 



Tel. reversed. 



51 E. 

 52 

 50 

 50 

 50 



50.6 



40. 1 W. 



S. end. 



2 52 W. 

 2 48 

 2 48 



2 49.3 



1 38 E. 

 1 38 

 1 38 



1 38 



35.6 W. 



6.4 E. 



Vernier, 296° 32' 20" 



NEEDLE INVERTED. 



Tel. reversed. 



N. end. 



05 E. 



05 



05 



2 05 



45 E. 



N. end. 



3 55 W. 

 3 50 

 3 45 



3 50 



25 E. 

 35 



40 



38.3 



1 38.3 \V. 



Tel. direct. 



35 W. 

 30 

 15 



26 



55 E. 



55 



50 



1 53.3 



43.6 E. 



Vernier, 



2 03 W. 



296 32 15 



Observations for azimuth of Polaris 



Tel. direct. 



Tel. reverse. 



Chron. time. 



1" |s m 46 s . 

 51 53.8 

 54 52.0 



1 51 50.6 



Circle reads. 



301° 15' 15" 



16 15 



17 10 



:;nl 16 13 

 Mean of limes, 

 Mean circle reading, 



Chron. timo. 



2 h 04 m 06". 1 

 08 13.6 



2 06 10.0 



l' 1 59 m on".:; 

 301° 17' 54" 



Circle reads, 



301° 19' 00" 

 20 10 



301 19 35 



