Now suppose we
wish to delineate the entrance pallet as if not in contact with the
escape-wheel tooth--for illustration, say, we wish the inner angle of
the pallet to be at the point _v_ on the arc _s_. We draw the radial
line _B l_ through _v_; and if we draw another line so it passes through
the point _v_ at an angle of twenty-seven degrees to _B l_, and continue
said line so it crosses the arc _p_, we delineate the impulse face of
our pallet.
We measure the angle _i n B_, Fig. 92, and find it to be seventy-four
degrees; we draw the line _v t_ to the same angle with _v B_, and we
define the inner face of our pallet in the new position. We draw a line
parallel with _v t_ from the intersection of the line _v y_ with the arc
_p_, and we define our locking face. If now we revolve the lines we have
just drawn on the center _B_ until the line _l B_ coincides with the
line _f B_, we will find the line _y y_ to coincide with _h h_, and the
line _v v'_ with _n i_.
HIGHER MATHEMATICS APPLIED TO THE LEVER ESCAPEMENT.
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