[Illustration: Fig. 156]
[Illustration: Fig. 157]
It occured to the Abbe d'Hautefeuille to form a sort of resilient
mechanism by attaching one end of a hog's bristle to the plate and the
other to the balance near the axis. Though imperfect in results, this
was nevertheless a brilliant idea, and it was but a short step to
replace the bristle with a straight and very flexible spring, which
later was supplanted by one coiled up like a serpent; but in spite of
this advancement, the watches did not keep much better time. Harrison,
the celebrated English horologist, had recourse to two artifices, of
which the one consisted in giving to the pallets of the escapement such
a curvature that the balance could be led back with a velocity
corresponding to the extension of the oscillation; the second consisted
of an accessory piece, the resultant action of which was analogous to
that of the cycloidal curves in connection with the pendulum.
CORRECTING IRREGULARITIES IN THE VERGE ESCAPEMENT.
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