C 529 J 
ference of latitude between the two ftatioiis of the obfer- 
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vatoiy, comes out 54,1, 54,7, 54,0, 55,4, 55,0, 55,0, 
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54,0, 54,3, 53,1, refpedlively; the mean of all 
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which is 5 4, 2 ; the greateh difference of any one refiilt 
from the mean being only 2''. In like manner, by lingle 
obfervations of as many ftais; viz. ^ and a, Caffiepeae; 
s Urfse majoris; 39, 46, o, 49, and 53, Dfaconis; and 
■23 Gygni; made on both fides of the hill, with the plane 
of the feftor facing the Ealf; after making all the al- 
lowances as before, the apparent difference of latitude 
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comes out 54,5, 52,3. 5^,8, S3>S> 54>S> 57 ) 2 > S6,i, 
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55j 3? refpedtively ; the mean of all which 
is 55"; the greateft difference of any one refult from the 
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mean being 2". The tvro means 54,2 and 55,0 differ 
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only 0,8, w'hich flionld argue only an alteration of 0,4 
in the line of collimation; but this is too fmall a quan- 
tity to be depended on ; aiid therefore it is mod: probable, 
that the flate of the infframent remained unvaried. 
Hownver, whether it did or no, the mean of the two 
// 
means, or 54,6, is to be efleemed the apparent difference 
of latitude between the two ftations of the obfervatory, 
and, when compared with the difference of latitude wdiicli 
Ihould. refult from the trigonometrical meafures, wall 
give the fum of the two contrary attractions of the hill. 
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