MARYLAND GEOLOGICAL SUEVEY 



217 



tree and 88 feet from southeast corner of court-house; marked by 

 a hickorv tent peg driven ahnost flush with the ground. The mark 

 used in 1903 was the west end of the ridge of a small frame shack 

 about 350 yards distant, bearing 62° 36.'6 east of true south. Soil, 

 sandy. 



Upper Marlboro, 1900. — The South meridian stone is in the 

 Academy grounds 75 feet from the front door of the Academy build- 

 ing and 58 feet from the fence on the street. The North meridian 

 stone is also in the grounds of the Academy, on the edge of the bluff. 

 From the South stone the cupola of the Southern Maryland Bank 

 bears 42° 58' east of true south. 



The following table is reproduced from p. 483 of the First Rcpor*, 

 without change, except that it has been extended to 1910. 



Change in Magnetic Declination at Upper Marlboro from 1700 to IfllO^ 



Year 

 Jan. 1. 



1700 

 05 

 10 

 15 

 2(1 

 35 

 30 

 35 

 40 

 45 



1750 



Needle 

 pointed. 



Year 

 Jan. 1. 



Needle 

 pointed. 



5 17 W 

 5 07 W 

 4 fi4 W 

 4 39 W 

 4 21 W 

 4 03 W 

 3 45 W 

 3 25 W 

 3 05 W 

 2 45 W 

 2 26 W 



1750 

 55 

 60 

 65 

 70 

 75 

 80 

 85 

 90 

 95 



1800 



2 26 W 

 2 07 W 

 1 51 W 

 1 35 W 

 1 19 W 

 1 06 W 

 55 W 

 45 W 

 39 W 

 36 W 

 34 W 



Year 

 Jan. 1. 



1800 

 05 

 10 

 15 

 20 

 25 

 30 

 35 

 40 

 45 



1850 



Needle 

 pointed. 



34 W 

 33 W 

 35 W 

 39 W 

 45 W 



.55 W 



1 07 W 

 1 20 W 

 1 37 W 



1 53 W 



2 11 W 



Year 

 Jan. 1. 



1850 

 55 

 60 

 65 

 70 

 75 

 80 

 85 

 90 

 95 



1900 

 05 

 10 



Needle 

 pointed. 



2 11 W 

 2 29 W 



2 "9 W 



3 08 W 

 3 29 W 



3 47 W 



4 06 W 

 4 23 W 

 4 40 W 



4 55 W 



5 09 W 

 5 37 W 

 5 52 W 



The declination is west over the county and is increasing now at 

 the average annual rate of 5 minutes. 



Hill, l<S6S.—ln the vicinity of the Coast Survey triangulation 

 station of 1850. 



Bowie, 190S. — In an old field in the northern part of town, 350 

 yards (320 meters) north of the railroad station, 130 feet (39. o 

 meters) south of Episcopal church, 45 feet (13.7 meters) west of 

 the path leading to Episcopal church, and 27 paces east of small 

 willow tree on the edge of a shallow gully. The station is about in 

 line with water tank tower and cross on Episcopal church, and is 



