(rood) 
A New InventUno^ Clock afceni.fnt on a Plain inclined: 
By Mr. De :Gennes 5 an Officer Ulonghg to the Sea, hx- 
traded out of the Jofirnal Des ScavaDs. 
WE have formerly feen Clocks , that never go , but 
when they are applied upon a Plain inelin'd But 
We never yetfawany Clocks that wind up again of them- 
felves upon the fame Plain. There is to be feen in Mr. Cof- 
pi*s Study , a Wooden Wheel , which works the fame efFedt 
upon a Plain Inclin*d , invented by Mr. Bondoni^ a Floren* 
itne Secretary to the faid Marquis. But in regard M* Lega- 
ri doch not unfold this fecret; and for that M. de G<?»»^j 
having found out the fame , hath fuccesfully ^pplyd it to a 
Clock^the mannr hereof, which he communicated unto me, 
1 fljall here impart. 
Fig.g.reprefentstbe 
infide ofcheMacbin 
placed upon a Plain 
Inclined. The whole 
Invention confifts 
in a Weight, which 
caufes the Macbire 
to play ' after the 
following manner. 
The Circle P G H being placed upon a Plain loclin'd, 
AB \^ divided into two uti equal parts by the LineG /. To 
reftoreto the leaft Sefture its equilibrium there is faftned to 
theextremity of thei?4^/W JD jF, a Weight F. which is fuf- 
ficiently heavy to recover what the leflTer Seflure lofes by its 
fituation, That a Wheel or Clock may thus ftand not only 
in equilibrium J but alfoafcend upward, there is placed in 
the middle of the Clock a Drum, which enclofts the fpring 
of the Pendulum, upon which Drum is fattened the Radius 
D F. For thus the fpring being mounted , enforces the 
Drum to turn, andfo to raife the Weight , which it can- 
not raife, without its becoming more heavy , in regard that 
coming to the point F. it is farther from the Centre, than 
when ic was in F. and thus all che Wheel turns on that fide 
as the fpring gives way. 
M*de Gennes Aox\) not here give direftlon how the 
Wheels thitcompofe the Clock are to be made, becaufe 
there 
