38 ASTRONOMICAL OBSERVATIONS, 



DifF. in time between the paffage of ft Urfs Maj. and! i, , --t 



Fomalhout over our line " ' " J 



Right Afcenfion of /3 Urfa: Maj. 5= 12° 1 1' 4" 

 Do. of Fomalhout 11 11 26 34 



This error of 2'' in time, is equal to an angle of 10" the error 

 of the line towards the welt. 



DifF. in time between the paflage of a Urfae Aiin. and tl 1, ^i j 

 Urfoe Maj. over our line - - J 



By this lad obfervation, our direftion appears to be inclined 

 to the weft, by an angle of 25". 



Error of the line by y Capri, and j8 Cephi. o' 46" 



Do. by ^ Urfce Maj. and Famalhout, o 10 



Do. by « Urfa Min. and « Urfse Maj. o 25 



3)1 II 



Mean error towards the weft - o ^3t 



This correftion of 23"! was made on a bafe of 40 perches, 

 which clofed our operations that feafon.* 



The year following, (viz. in 1786,) the Hhc was carried on 

 about 55^ miles to Lake Erie by Andrew Porter, and Alexander 

 Maclain : in that diftance the direftion was not correfted by any 

 obfervations, neither could it appear very necefTary, when we 

 confider how trifling, and unimportant all the errors were which 

 had been difcovered the preceding feafon. — The line was run 



by 



* Dr. Rittenhoufe, Jofeph Nevil, Andrew Porter, and myfelf were con- 

 cerned in this line. Jnfeph Nevil left us about the 21ft of Auguft, and Dr.. 

 Rittenhoufe about the 17 th of September. 



