_h_, in the end view, as a centre, the arc _g'_ is
marked. With the compasses set to the length of thickened line _i_, and
from _h_ as a centre, arc _i'_ is marked, and with the length of
thickened line _j_ as a radius and from _h_ as a centre arc _j'_ is
marked; from these arcs lines _k_, _l_, _m_ are drawn, and from the
intersection of _k_, _l_, _m_, with the circle of A, lines _n_, _o_, _p_
are let fall. From the lines of division, _d_, _e_, _f_, the lines _q_,
_r_, _s_ are drawn, and where lines _n_, _o_, _p_ join lines _q_, _r_,
_s_, are points in the curve, as shown by the dots, and by drawing a
line to intersect these dots the curve is obtained on one-half of B.
Since the axis of B is in the same plane as that of A, the lower half of
the curve is of the same curvature as the upper, as is shown by the
dotted curve.

[Illustration: Fig. 228.]

In Figure 228 the axis of piece B is not in the same plane as that of D,
but to one side of it to the distance between the centre lines C, D,
which is most clearly seen in the top view. In this case the process is
the same except in the following points: In the side view the line _w_,
corresponding to the line _w_ in the end view, passes within the line
_x_ before the curve of intersection begins, and in transferring the
lengths of the full lines _b_, _c_, _d_, _e_, _f_ to the end view, and
marking the arcs _b'_, _c'_, _d'_, _e'_, _f'_, they are marked from the
point _w_ (the point where the centre line of B intersects the outline
of A), instead of from the point _x_. In all other respects the
construction is the same as that in Figure 227.

[Illustration: Fig. 229.]

In these examples the axis of B stands at a right-angle to that of A.
But in Figure 229 is shown the construction where the axis of B is not
at a right-angle to A. In this case there is projected from B, in the
side view, an end view of B as at B', and across this end at a
right-angle to the centre line of B is marked a centre line C C of B',
which is divided as before by lines _d_, _e_, _f_, _g_, _h_, their
respective lengths being transferred from W as a centre, and marked by
the arcs _d'_, _e'_, _f'_, which are marked on a vertical line and
carried by horizontal lines, to the arc of A as at _i_, _j_, _k_. From
these points, _i_, _j_, _k_, the perpendicular lines _l_, _m_, _n_, _o_,
are dropped, and where these lines meet lines _p_, _q_, _r_, _s_, _t_,
are points in the curve of intersection of B with A.