Parallax of the Fixed Stars . 93 
repeated to be doubtful, and has alfo been confirmed by others 
of nearly the fame nature : for inftance, the fmalleft of the 
two that accompany the ftar near k Aquilae, the fmall ftar 
near p Herculis, and the fmall ftar near Lyras, are invifible 
with my power of 227, and vifible with the fame aperture 
when the power is 460. Alfo the fmall ftars near flam- 
stead’s 24th of Aquila, the fmalleft of two near a- Coronas, 
the fmall ftar near the ftar fouth of £ Aquila, the fmall ftar 
near the fecond 0 Perfei, the fmall ftar near the ftar which 
accompanies flamstead’s 10th fub pede et fcapula dextra 
Tauri, the fmall ftar, near (2 Delphini, and the fmall ftar near 
the pole ftar, are all much brighter and ftronger, and therefore 
much fooner feen with 460 than with 227. 
Great power may alfo, in particular circumftances, be fa- 
vourable, even with an excels of aberration. When two ftars 
are fo clofe together as to make the fcale for meafuring the 
diftance of their centers too fmall, if, by magnifying much, 
we can enlarge that diftance, we may gain a confiderable ad- 
vantage, provided the centers or apparent bodies of the ftars 
remain diftinct enough for the purpofe of thefe meafures. The 
appearance of a Lyras in my Newtonian refledlor with a power 
of 460 is reprefented in fig. 2. ; with 2010 in fig. 3. ; with 
3 168 in fig. 4.; and with 6450 in fig. 5. Now in all thefe 
figures we fee, that the centers are ftill diftindl enough to mea- 
sure their diftances with fufficient truth ; or if any little error 
fhould be introduced by the magnitude of the central point, it 
will be more than fufficiently balanced by the largenefs of the 
fcale. In this manner, with a power of 3168, I have obtained 
a fcale of no lefs than ten inches fix tenths for the diftance of 
the centers of the two ftars of a Geminorum ; and as we 
7 know 
