C *43 ] 
the middle was pad: j while Mr, Bird and myfelf, 
with the old micrometer applied to the 1 5 foot tube, 
fhould meafure the Moon’s diameter as feen upon the 
Sun : But unfortunately, fome time before the middle 
of the eclipfe, the hazinefs became fo very thick that 
we loft fight of the Sun for many minutes. But as 
foon as the clouds began to difperfe, Mr. Reeve ob~ 
ferved the lucid parts as under, but did riot afcertain 
the time at either obfervation. 
2 ' 55 ". 5 — 3 ' °"> 2 — 3 ' 28 "> 7 — 3 ' 47 ". 6 with 
feveral others that increafed much fafter. By a mean 
of fix obfervations made (as near the middle as the 
clouds would permit) both by Mr. Bird and myfelf, 
the extremes of which did not differ fo much as 3", 
the Moon’s equatorial diameter was found to be 
29' 454." as feen on the Sun. 
As the obfervations of the lucid parts were mad® 
as faft as the numbers of the micrometer could be 
read off, and as the difference increafed but flowly at. 
firft, we will fuppofe the two firft obfervations to 
have been made not long after the time of the mid- 
dle, and at the time of the firft obfervation, the Sun 
was at leaft eclipfed 10, 9 digits* 
The Sun’s horizontal diameter, as obferved by Mr. 
Reeve, with the fame micrometer, on the day be- 
fore, and on the morning of the eclipfe, was 31' 
being a mean of fix obfervations not fenfibly dif- 
fering. 
About 1 1 o’clock the hazinefs became fo thick 
that no further obfervations could be made, nor, at 
the time when the end was expected, could the Sun 
be feen. 
At 
