From
_f_, and at right angles to said line _A f_, we draw the line _f e_
until it crosses the line _A B_.
Now this line _f e_ is tangent to the arc _a_ from the point _f_, and
consequently a locking placed at the point _f_ is a true tangential
locking; and if the resting or locking face of a pallet was made to
coincide with the line _A f'_, such locking face would be strictly
"dead" or neutral. The intersection of the line _f e_ with the line _A
B_ we call the point _C_, and locate at this point the center of our
pallet staff. According to the method of delineating the lever
escapement by Moritz Grossmann the tangent line for locating the center
of the pallet staff is drawn from the point _c_, which would locate the
center of the pallet staff at the point _h_ on the line _A B_.
Grossmann, in delineating his locking face for the draw, shows such face
at an angle of twelve degrees to the radial line _A f'_, when he should
have drawn it twelve degrees to an imaginary line shown at _f i_, which
is at right angles to the line _f h_.
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