eviation, then the angle of loss must be measured on the
_real_ diameter of the wheel and not on the primitive, as is usually
done, as the real diameter of the wheel, or in other words the heel of
the tooth, forms the last point of contact. With a wider tooth and a
greater lifting angle there will even be a _gain_ of lift on the
engaging pallet; the pallet in such a case would actually require a
smaller lifting angle, according to the amount of gain. We gave full
directions for measuring the loss when describing its effects in Fig. 8.
Whatever the loss amounts to, it is added to the lifting plane of the
pallet. In the diagram under discussion there is no loss, consequently
the lifting angle on the pallet is to be 5 1/2deg. From V' A we draw V A at
the required angle; the point of intersection of V A with the path O
will be the discharging edge O. It will now only be necessary to connect
the locking corner M with it, and we have the lifting plane of the
pallet; the discharging side of the pallet is then drawn parallel to the
locking face and made a suitable length. We will now draw the locking
edges of the tooth by placing the center of the protractor on the
locking edge M and construct the angle B M M' of 24deg. and draw a circle
from the scape center B, to which the line M M' will be a tangent. We
will utilize this circle in drawing in the faces of the other teeth
after having spaced them off 24deg. apart, by simply putting a ruler on
the locking edges and on the periphery of the circle.

We now construct W' A as a tangent to the outer circle of the wheel,
thus forming the lifting angle D A W' of 3deg. for the teeth; this
corresponds to the angle T A C on the engaging side. W' A touches the
outer circle of the wheel at the intersection of F B with it. We will
notice that there is considerable deviation of W' A from the circle at
the intersection of J B with it. At the intersecting of this point we
draw U A; the angle U A W' is the loss of lift. This angle must be added
to the lifting angle of the pallets; we see that in this action there is
no loss on the engaging pallet, but on the disengaging the loss amounts
to approximately 7/8deg. in the action illustrated. As we have allowed
1/4deg. of run for the pallets, the discharging edge P is removed at
this angle from U A; we do not illustrate it, as the lines would cause
confusion being so close together. The lifting angle on the pallet is
measured from the point P and amo