Maker, W. Jackson,
Below is a an exploded veiw of the escapement. Invented in 1704 by Peter Debaufre it is
the first frictional rest escapement produced. It consists of two saw tooth escape wheels
of the same count mounted on a pinion, their teeth staggered, driven by a contrate wheel.
The balance staff has a pallet in a form of a disc mounted with its face set between the
escape wheels level with the pinion. The pallet has an inclined face on which the teeth of
the escape wheel act and provide impulse to the balance. When the tooth of one wheel drops
from the incline a tooth from the other wheel falls onto the flat face of the pallet where
it stays at rest until the balance swings back under the influence of the hairspring when
this tooth provides impulse in the opposite direction. The Debaufre escapement tends to
wear quite rapidly and places considerable end thrust on the top pivot which always has an
endstone or polished steel plate.
Note in the photos above that all of the escapement components and second wheel (of a
total of 5 wheels in the going train) all lack conventional pivots at the end of their
respective arbors. Instead a needle pivot on the end of a threaded rod and equipped with a
knurled stop nut is screwed into a hole in the frame and secured (photo four). This pivot
mates into the holes at the ends of their respective arbors. When constructed properly,
this system has less friction than conventional arbor-mounted pivots. The last photo
(below) shows the area containing the various cocks stripped of the escapement components
to better reveal the needle pivots inserted into these as well as the frame.