670 The Account of a 



Mr. Bradley's observations for finding the latitude, were 



made with a quadrant of one foot radius, the workmanship of 



Mr. Bird ; they were as follows. 



Nine meridional altitudes of the sun's limb, the 

 extreme results of which were 49° 57' 27'',5 and 

 49 57' 44", gave for the latitude of the Obser- 

 vatory - 49 si 35" 



Six meridional observations of the Pole Star be- 

 low the Pole, the extreme results of which were 



49° 57' 35" and 49° 57' 20 ">4> g ave for the la ~ 



titude - - - - 49 57 23 ,2 



Thirteen observations of Arcturus, a. Coronae Bo- 

 realis, and a. Serpentis, the extreme results of 

 which were 49 57' 54^7 and 49 57' 2",7, gave 

 for the latitude - - - 49 ^ 29 



Fifteen observations of a, /3, y Draconis, the ex- 

 treme results of which were 49°57' 22",2 and 

 49° 57' z"7> g ave f °r the latitude - 49 5? 33 



The mean of which is - 49 57 30 

 According to the trigonometrical operations, the latitude is 

 49 57' 44" ; there is, therefore, a difference of 14" between the 

 results ; a quantity so large as justly to excite surprise, if it were 

 not generally understood, that much dependance cannot be 

 placed on observations made with an astronomical quadrant 

 precisely similar to that made use of by Mr. Bradley. The 

 extreme results in the above, differ so widely as to authorise the 

 truth of the supposition on this occasion. 



The longitude of the Lizard was determined by the transit 

 of Venus, Sun's eclipse, transit of the Moon, and two emersions 



