39 



Note. — It •will be observed, that since the last repair of 

 the axis of the Greenwich T. inst. the difference of the 

 observed differences of AR. of any two stars never amounts 

 to two-tenths of a second, so that if one-tenth of a second 

 be allowed as the probable error of observation and counted 

 as will appear from the sum of the + and — differences in 

 the opposite directions, the observed places of the several 

 stars will be found to agree to half-a-tenth of a second in 

 each place. The sum of the + differences at Greenwich is, 

 57, and of the — , 57- The sum of the + differences in. 

 1802 is 2,34, and of the — 2,49- 



A view 



