344 ASTRONOMICAL and 



msridian. Tli« fame operation was performed a fecond t'me, and although 

 the difference in the refults, appeared too trifling to need any attention, it 

 was neverthelefs bifefted, and that point of 'bifeftion taken for the meri- 

 dian, — which is defignated by AE and terminated by a parallel of latitude 

 drawn through B. — From the point A, a vifta was opened to the fummit 

 of the liill at B : from B, to C, another vifta was opened, which formed 

 the bafe : the bafe was too lliort if it could have been avoided ; but the 

 hill would not admit of its being any longer. — D the fignal on the eaft fide 

 of the fwamp. — The angles were meafured on the horizontal arc of the 

 aftronomical circle already mentioned. — This inftrument by means of a 

 \ernier is graduated to 5", whicla by the help of a microfcope miy be eafi- 

 ly fubdivided by the eye, into It, or 2 feconds. — The mealurements, and 

 angles fland as below. 



From thefe data, AE is found to be equal to 244.9 perches, BE to 

 191.26 perches, BD to 3211.65 perches, EF to 2987.44 perches, and DF 

 to 316.7 perches. DD being confidered as an arc of a great circle, form- 

 ing with the prime vertical an angle of 5" 42' 9" to the north, being the 

 cxcefs of the angles BAE, znd ABD above 90. — From the refult of the 

 obfervations for the latitude, the obfervatory appeared to be too far north 

 by 518.55 perches, which is defignated by AH. It therefore follows, that 

 die fignal at D, was too far north by the fum of the diftances DF, EA 

 and AH, which is equal to IC80.15 perches: this dillance was meafured 

 due foulh from the point D, and would interfeift the paralell of 31", at the 

 end of 215 miles and 169.6 perches from high water mark on the Miffif-. 

 iippi. 



From the termination of the above mentioned loSo. 15 

 perches, another guide, or compafs hne was continued 

 eaft, to the eaft fide of the Coenecuch j but the termina- 

 tion of the compafs hne, not being in a proper place for 

 a courfe of obfervations, the obfervatory was ereded 

 north of it, in the meridian of the termination of the 

 257lh piile; where the following obfervations were made. 



1799. 



