We draw the line _n o_ and define the impulse face
of the exit pallet. If we mentally analyze the problem in hand, we will
see that as the exit pallet vibrates through its ten degrees of arc the
line _B d_ and _B c_ change places, and the tooth _D''_ locks one and a
half degrees. To delineate the locking face of the exit pallet, we erect
a perpendicular to the line _B e_ from the point _n_, as shown by the
line _n p_.
From _n_ as a center we sweep the short arc _t t_, and from its
intersection with the line _n p_ we lay off twelve degrees, and through
the point so established we draw the line _n u_, which defines the
locking face of the exit pallet. We draw the line _o o'_ parallel with
_n u_ and define the outer face of said pallet. In Fig. 21 we have not
made any attempt to show the full outline of the pallets, as they are
delineated in precisely the same manner as those previously shown.
We shall next describe the delineation of a club-tooth escapement with
pallets having equidistant locking faces; and in Fig.
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