[ 23 ] 
my Obfcrvations, that were moft proper to deter- 
mine the Tranfverfe Axis of the Ellipfis, which each 
Star Teems to deferibe ; and have found it to be 
neared to 40" $ which Number I therefore make 
ufe of in the following Computations. 
The Divifions or Points upon the Limb of my 
Sc&or are placed five Minutes of a Degree from each 
other ; and are numbered fo, as to fhew the Polar 
Didances nearly ; the true Polar Didance exceeding 
that, which is fhewn by the Indrument, about 1'. 3 f. 
When I fird began to obferve, I generally made ufe 
of that Point on the Limb, which was neared: to 
the Star's Polar Didance, without regarding whether 
it was more Northerly, or more Southerly than the 
Star: but as it fometimes happened, that the Ori- 
ginal Point, with which I at fird compared the Star, 
became, in Procefs of Time, pretty remote from it 5 
I afterwards brought the Plummet to another Point, 
that was nearer to it; and carefully examined, what 
Number of Revolutions of the Screw of the Micro- 
meter <&c. correfponded to the Didance between 
the different Points, that I had made ufe of: by 
which means I was able to reduce all the Obfcrvations 
of the fame Star to the fame Point, without fuppofing. 
the feveral Divifions to be accurately f afundcr. 
I have expreffed the Didance of each Star from 
the Point of the Arc, with which it was compared, 
in Seconds of a Degree and tenth ‘Parts of a Second, 
exaftly as it was collected from the Obfcrvations ; 
altho' 1 am fenfible, that the Obfcrvations them- 
felves are liable to an Error of more than a whole 
Second j bccaufe I meet with Tome, that have been 
made within two or three Days of each other, that 
differ 2", even when they are not marked as de- 
fective in any refpett. k 
