444 An Account of the Measurement 
bearings of the other objects, as extracted from that Paper, will 
be as follows. 
''.44" NW 
r\ vv 
jsjW [.from the meridian of 
Dunnose. 
Luttreli/s Folly 23’ o r 
East Cowes sea mark 19 11 19 
Portsmouth Church 19 9 40 NE J 
If, from the readings on the limb, the angles between the 
obelisk and the other objects be taken, and applied to the last- 
mentioned bearings, we shall get the angle between the obelisk 
and the meridian, 87° 42' 40" 
35 
-Mean, 87° 42' 40". 
45 J 
May 9th. Erected the observatory, drove four long stakes 
into the ground, and brought their several heads into the same 
horizontal plane. Then erected the stand, set up the sector, and 
adjusted the axis level, and the akis itself; determined the exact 
weight the plumb-line would bear, and then examined how 
much the cross wires were out of their proper positions, as 
follows. 
The stand being firmly screwed down to the stakes, the 
sector was turned on its axis, till the pointed top of Sir Richard 
Worsley’s obelisk appeared in the field ; it was then clamped to 
the azimuth circle, but subject to a small motion by turning an 
adjusting-screw. The pointed apex was then made to appear as 
just vanishing under the wires ; in which situation of things, the 
side telescope was turned round, and laid in its several positions 
on the brass frame attached for its reception to the side of the 
sectorial tube ; the top of the obelisk appearing as a vanishing 
point under the wires. On whichever face of its squares it was 
made to rest, the vernier of the azimuth circle read off to 84° 5'. 
The little telescope was then taken out of its frame, and the 
