C 189 ] 
XXV. Obfervatlons of the laft of 
Venus, and of the Eclipfe of the Sun the 
next Day ; made at the Houfe of Jofhua 
Kirby, £/5'^/r^,^/Kew^'. By lohnBevis, 
M. D. F. R. S. 
Readjuaei^, T" N the morning of June 2, 1769, I 
^769- Jl^ fixed my equal altitude indrument, 
and carefully rectified it ; and, applying the proper 
correction to the fore and afternoon’s correfponding 
altitudes of the Sun, I found that Mr. Kirby’s clock, 
whofe rate of going was well regulated to mean folar 
time, at noon was 2 ' 5'' before the mean time ; 
whence I deduced the apparent times of my obferva- 
tions. June 3, in the evening, I was alone in a 
room where I had a very commodious view of 
the Sun. My telefcope was a very good reflector, 
of about three feet and a half focal length, with an 
aperture of near fix inches, and a magnifying power 
of 120 times; it was fleadily fupported, and go- 
verned by rack-work, and I had a flop-watch in 
my hand. Mr. Kirby at the clock. 
* Mr. Kirby’s houfe is exactly 4"! of time eaft of his 
Majefty’s domeftic obfervatory, and i' 14" weft of the Royal 
obfervatory at Greenwich, 
5 App. 
