of an Arc of the Meridian. 
4 % 
Between Dunnose and Arbury Hill. 
@ Draconis - - i° 36' 19", 42 
y - - - 19,36 
45 d 20,45 
46 c — — — - - 1 9> 6 3 
51 3 9-59 
1 x Cygni - 3 9’94 
10 , - 19,77 
y\ Ursae -• - 21,70 
Mean amplitude - - 1 36 19,98 
Between Dunnose and Greenwich. 
@ Draconis - - o° 51' 32", 11 
7 - 32,24 
45 d - 3*> 8 5 
Si - 29,90 
1 k Cygni - 3°>99 
10 i — - - 30,28 
y Ursse - 31,56 
yj 32,14 
Mean amplitude - - o 51 31,39 
It is very generally known that his Grace the Duke of 
Marlborough is possessed of an excellent quadrant, made by 
the late Mr. Ramsden, and that he has for some years been in the 
habit of using it at Blenheim. As my meridional line is not far 
eastward from his Grace’s observatory, the zenith distance of any 
star or stars there determined, from a course of accurate obser- 
vations, must afford me the means of ascertaining the lengths of 
the degrees on the meridian, at the middle points between 
Blenheim and the two extremities of my arc. I therefore ap- 
plied to his Grace, requesting him to favour me with any 
observations he might have made, and with permission to publish 
mdccciii. 3 R 
