( io8o ) 
I. A Letter o/A/r.Jofeph Williamfon Watchmaker, 
to the Tuhlijher, wherein he ajferts his ^ight to the 
' curious and ufeful Indention of making Clocks to 
keep Time with the Suns Apparent Motion, 
H Aving been inform’d of a French Book lateiy pub- 
lifhed, wherein the Author fpeaks of making 
Clocks to agree with the Sun’s apparent Motion 5 and fup- 
poleth that it was a thing never thought of by any before 
himfelf.- I was therefore willing by the advice of (bme 
of my Friends, to write this fliort Account of what I 
have performed in that matter my felf. 
r And in the firfl place I mull take notice of the Copy 
of a "Letter in this Book, wrote by one Krefa a JeJuit, 
to one Mr Williamfon, Clockmaker to his Imperial Ma' 
j^Jly; of a Clock found in the late King Charles the 
Second of Spains Cabinet, about the Year 1 699 or 1 700.- 
which llieweth both equal and apparent Time according 
to the Tables of Equation; and which went 400 Days 
without winding up. This I am well fatisfied is a 
Clock of my own making; for about fix Years before 
that time, I made one for Mr. Daniel ^uare, for whom 
I then wrought moftly, which agrees with the Delcrip- 
tion he gives of it, and went 400 Days as he faith. 
This Clock Mr. Daniel Square fold, foon after it was 
made, to go to the faid King Charles the Second of 
Spain: and it was made fo that if the Pendulum was ad- 
julled to the Suns mean Motion, the Hands would 
Ihew Equal Time on two fixed Circles, on one the 
Hour, and on the other the Minute. But there were 
other two moveable Circles of the fame kind, that 
moved 
