to this hour as great a Secret, as if they had never been. 
~ Now whether I have difcover'd this or no, wiil ap- 
pear from the Account I am now about to give thereof; 
which I fiiall deliver with all the clearnefs I can in this 
method following, i. By propoling the State of the 
Floblem, or declaring what is to be done. 2. By offer- 
ing Ift a Solution thereof, and^lliewing from allow'd 
Maxims in cy^^i^w, and other Principles proper to the 
Qaeftion inhand^the Reafons how,and the Caufes where- 
by it may be effected. 
I. The ftate of the Problem, may be comprizd in 
thefe four particulars; bydelcribing i. Tho^Movemetit 
as to its exterior ftrudture 2. The manner of its mo- 
tion, as it appears to the Eye. 3. The ufe thereof in 
the meafuring of time. 4. The way of adjufting this 
Motion to the exadt divifions of an hour. All which 
foremention'd particulars (were the Movement acSually 
jtnade,;^ would be obvious to the apprehenfions of any 
Spectator, who perhaps might never be able to compre-> 
hend the Reafons of the Motion it felf. 
I. For the exterior ftruiture of the Movement y be 
pleas d to fee iv^, which reprefents a circular body of 
3 inches 2 diameter, confiding of 2 plates meafurd by' 
the fame ^dius^ and fixt in a parallel pofition to each 
other by the hoop, (/7.) the bredth of which is about 
an inch. This hoop and the 2 Plates form the Caie of 
the Movement ; of which, that which appears in the front, 
is towards the verge thereof infcrib'd with a horary cir- 
cle, the divifions whereof anfwer the hours of a natu- 
ral day. The deep fliades within this circle are intend- 
ed to reprefent a Concave, of near half an inch deep ; 
and the prominence (^. ) in the middle of this Con- 
cave, is a hemifphere of Brafs or Silver , riding loofly 
on a pin, which lies hid, and is the Jxm oi xho. Move- 
'ment. The upper half of this hemifphere is holiow, 
but the nether fill'd with Lead; and the fmall Gen- 
tlernan that fits thereon, does with an eredred finger 
perform the office of an Index. The Reafon why thig 
plate 
