196 



By observations on the north meridian, July 4, 13, and 20, we 

 have 



The observations of July 4 and 13, and the above approximate 

 elements, give U — V =— 588",7. 



And those of July 4, and July 20, give U'— V'=— 655, 5. 



The processes for finding U, U' and V, V give the angles, by 

 which the coefF. of dp and dt are determined. By help thereof we find 



d^ = 18841 df— 572072 dp 

 d/= 9380 df— 657490 dp 

 d/'= 5859 d(— 595680 dp 



X = ^^i^ = 7555 dt+377S0Q dp 



X = 



sm 1 



d log r' 

 sm I 

 d loff r" 



= 7531 dt+79355 dp 

 = 6065 df— 9430 dp 



sin 1" 



dr = —4,682a; : d/3 =— 0,927^- 



dx'= +0,4'29x': d/3' = + 11,886a;' 



cW" = —0,641 2" : d^" =+ 3,08 1 a;" 



I 

 I 



