Survey of Oyster Bars, Some/set County, Md. 



59 



"back" bearing (corrected for local magnetic declination), given in the fourth column 

 of the tables opposite the "corner" in question and on line with the name of the "sta- 

 tion" being occupied. The direction thus determined will give one range on which 

 the desired point must be located. The compass can then be moved to a second trian- 

 gulation station and another range located in a similar manner. The intersection of 

 these two range lines will give the desired point; but in general it should be checked 

 by an additional range line determined from a third station. 



(5) Horizontal angles measured at landmarks. — This process is a modification of the 

 triangulation method, and will be useful to engineers who have a transit and desire 

 considerable accuracy. 



The instrument is placed over a "triangulation station," the name of which appears 

 in the last column of the tabular description opposite the "corner" in question. The 

 telescope is then pointed to the landmark indicated in the "Descriptions of landmarks" 

 as having a direction of o° 00' 00" from the triangulation station being occupied by the 

 transit. The tabular description of the boundaries is next examined and the "back" 

 bearing of the questionable boundary "corner" from the landmark being occupied is 

 taken out. The angle calculated from the "back" bearing and the bearing given in 

 parentheses alongside the zero landmark in the "Descriptions of landmarks" is then 

 set off on the transit, and a range line established on which the desired point must be 

 located. A similar process is then carried on at a second station, and so on until the 

 position of the buoy is satisfactorily fixed. 



BOUNDARIES OF NATURAL OYSTER BARS. 



TURTLE EGG ISLAND. 

 (Upper Tangier Sound — Charts Nos. 5 and 7 ) 



Cor- 

 ner 



Latitude 



/ // 

 38 05 49.58 



Longitude 



/ // 



76 00 03. 78 





True t 



earing 



Back 



Distance 



Yards. 



609 

 6113 



5553 



U. S. C & G. S. triangula 

 station 



'ion 



of 



bar 



S 



S 

 N 



Forward 





1 



t 



77 3« W 

 12 54 W 

 65 07 E 



/ 



N 77 38 E 

 N 12 53 E 

 S 65 09 W 



Miles. 



Solomons Lump Light 



Joshua. 





2 



38 06 24. 78 



76 OO 2 1. 47 



S 



N 

 N 



5 22 \Y 

 78 12 E 

 10 01 W 



N 5 22 E 

 S 78 14 W 

 S 10 01 E 



1323 

 5629 

 3400 



Miles. 



Joshua. 



Senator. 





3 



38 08 42.38 



76 00 20. OO 



S 



N 

 N 



26 01 W 

 77 22 E 

 22 08 W 



N 26 01 E 

 S 77 24 W 

 S 22 08 E 



1437 

 5582 

 3984 



Senator. 



Deal Island Church. 



Crab. 





4 



38 08 37.36 



75 59 n-44 



N 

 N 

 S 



69 02 E 

 40 45 W 

 65 28 W 



S 69 03 w 

 S 40 46 E 



N 65 27 E 



3878 

 5095 

 2700 



Deal Island Church. 



Crab. 



Senator. 





5 



38 05 57. 12 



75 59 10. 20 



S 



s 



N 



79 13 W 

 24 12 W 

 60 02 E 



N 79 12 E 

 N 24 11 E 

 S 60 03 W 



2059 

 6812 

 4168 



Miles 



Solomons Lump Light 



Joshua. 





