LATELY ERECTED AT THE ROYAL OBSERVATORY. 

 Table I. 



147 



Containing 60 successive observations of the small auxiliary star, Bode 170Draconis 



divided into series of 10 each. 



From this it appears that the mean error of 10 observations = 0"'155, and that the mean error of 30 obser- 

 vations, as deduced from the next page, = 0"-067. 



The zenith distance from this result =1 0-078 South. (Assumed co-latitude = 38° 31' 21"*.) 



Difference of latitude for zenith telescope r= +0'65 



Zenith distance for the latitude of zenith"! __ ^ 0*7 28 

 telescope J 



By zenith telescope by means of the sub-"l _ ^ ^.^^ ^j^j^j^ ^^ quantities are identical, 

 sidiary angle from the preceding page . . J 



* The accuracy of this quantity is of no importance, as the circles, according to our present mode of employ- 

 ing them, give, in fact, zenith distances, which are afterwards converted into polar distances by the application 

 of the above co-latitude, and as such are registered in the Greenwich Catalogues. 



u2 



