133 that the line _f_ does to the half shell (_D_) shown in Fig.
132. We draw the line _f'' f'''_, Fig. 133, which divides the cylinder
into two segments of 180 degrees each. We take the same space in our
dividers with which we swept the interior of the cylinder in Fig. 132
and sweep the circle _v_, Fig. 133. From _e_ as a center we sweep the
short arc _d''_, Fig. 133, and from its intersection of the line _f''_
we lay off six degrees on said arc _d''_ and draw the line _e' k''_,
which defines the angular extent of our entrance lip to the half shell
of the cylinder in Fig. 133. We draw the full lines of the cylinder as
shown.
We next delineate the heel of the tooth which has just passed out of the
cylinder, as shown at _D'_, Fig. 133. We now have a drawing showing the
position of the half shell of the cylinder just as the tooth has passed
the exit lip. This drawing also represents the position of the half
shell of the cylinder when the tooth rests against it on the outside.
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