[ l8 7 ] 
From 1 8th February to nth March, the clock 
had gained of equal time 3 7", which is near 2" ©f 
time per day. 
nth March to 10th April, the clock had gained 
of equal time 15", which is near 3" of time per 
day. 
4th June, afternoon, at 4 h 52' per clock. Altitude 
fun’s centre 2 7 0 40' 14", which is near 3" of time 
per day. 
6th June, afternoon, at 5 h 40' per clock. Altitude 
fun’s centre 24 0 29' c", which is near 3" of time 
per day. 
8 th June, afternoon, at 5 h 20' per clock. Altitude 
fun’s centre 23 0 45' 53", which is near 3" of time 
per day. 
9th June, noon, fun on the meridian, per clock, 
at 1 2 h 59' 32", which is near 3" of time per 
day. 
Thefe latter obfervations, (hewing the gain of the clock 
3 r/ time per day, furprized me, as being contrary 
to my expedition j for the clock had loft two or three 
leconds p°r day in winter, and therefore, I concluded 
it would lofe more in the (pring and fummer, by the 
lengthening of the pendulum j but it happened quite 
the contrary, and the caufe thereof I could not de- 
termine. 
For afcertaining the diameter of Venus, and alfo the 
pofition and diftance of the folar maculae from Venus, 
I had caufed to be conftruded an inftrument *, much 
like one which has been already defcribed to the So- 
* Angular micrometer. 
Bb 2 
ciety, 
