[ 49 ° ] 
I have already obferved, that, in order to render 
this clock as perfeCt as poffible, I made it, in feve- 
ral refpe&s, different from the common ones, in hopes 
of removing fome imperfections I apprehended they 
were liable to. But as, in this attempt, I fell into an 
error, which it was a confiderable time before I dif- 
cover’d, my making, the trial was thereby greatly re- 
tarded. And in order to prevent others from falling 
into the like miftake, I fhall beg leave to give fome 
£hort account of it. 
In a common clock the pendulum is ufually hung 
by a fpring to a cock on the back plate of the clock, 
W'hilff the wheel and pallets, by which the pendu- 
lum is kept in motion, are placed in the middle 
of the frame ; and the pendulum is moved by a 
piece of ffeel (call'd the crutch) riveted to one end 
of the arbor, to which the pallets are fattened. 
This difpotttion of the pieces I apprehended liable 
to fome confiderable objections : To remedy which, 
I contrived to fix the pallets to the upper part of 
the pendulum itfelf, above the centre of motion ; 
and, in order to make the pendulum vibrate as 
freely as poffible, it was made to turn upon two 
tteel points, and was hung in the middle of the 
frame, exaCtly under the fwing-wheel, and fo as to 
vibrate in the fame plane with it. By this means I 
was in hopes, that it would have moved with much 
greater freedom and regularity, than when hung after 
the common method j and, upon trial, it was found 
to move with fo great freedom, that a pendulum of 
above 20 pounds weight, when hung in its place 
without the clockwork, and made to vibrate thro’ 
an arch of two degrees, was found to make above 
1200 
