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LX. Obfervations of the Tranfit of Venus 
over the Sun, made at the Round "Tower in 
Windfor Caftle, June 3, 1769. By 
Daniel Flarris, Mafer of the Royal Ma- 
thematical School in Chrifl’s Hofpital, and 
F. R. S. In a Letter to the Reverend 
Nevil Mafkelyne, B. D, F. R. S. and 
AJl, 'onotner Royal. 
S I R, 
Read Dec. 
1769. 
21 
I 
HAVE taken the liberty to fend you 
my obfervations on the tranfit of 
Venus, as likewife thofe made for afcertaining the 
going of the clock j all which 1 fhould have done 
laft June, when I fent the times of the contads, to 
the end that they might, if you thought them wor- 
thy, have been communicated to the Royal Society 
through your hands ; but, waiting for an opportunity 
of ufing your tranfit-inftrument, in order to afcertain 
the longitude of Windfor, which you was fo 
obliging to lend me for that purpofe, prevented j 
and am forry ftill to fay, that I have not once been 
able to make ufe of it, on account of the badnefs of 
the weather at the feveral times I took it down with 
me for that purpofe. However, other methods have 
been 
