We have previously given instructions for drawing the pallet locked; and
to delineate the pallet after five degrees of angular motion, we have
only to conceive that we substitute the line _s'_ for the line _b'_. All
angular motions and measurements for pallet actions are from the center
of the pallet staff at _B_. As we desire to now delineate the entrance
pallet, it has passed through five degrees of angular motion and the
inner angle _s_ now lies on the pitch circle of the escape wheel, the
angular space between the lines _b' s'_ being five degrees, the line
_b''_ reducing the impulse face to four degrees.
DRAWING AN ESCAPEMENT TO SHOW ANGULAR MOTION.
To delineate our locking face we draw a line at right angles to the line
_B b''_ from the point _t_, said point being located at the intersection
of the arc _o_ with the line _B b''_. To draw a line perpendicular to
_B b''_ from the point _t_, we take a convenient space in our dividers and
establish on the line _B b''_ the points _x x'_ at equal distances from
the point _t_.
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