coating of glue. This done, the other frame pieces and
struts may be treated in the same way, and you will thus
get the foundations for the two planes.

Another Way of Placing Struts.

In the machines built for professional use a stronger
and more certain form of construction is desired. This
is secured by the placing the struts for the lower plane
under the frame piece, and those for the upper plane
over it, allowing them in each instance to come out flush
with the outer edges of the frame pieces. They are then
securely fastened with a tie plate or clamp which passes
over the end of the strut and is bound firmly against
the surface of the frame piece by the eye bolts of the
stanchion sockets.

Placing the Rib Pieces.

Take one of the frames and place on it the ribs, with
the arched side up, letting one end of the ribs come
flush with the front edge of the forward frame, and the
other end projecting about a foot beyond the rear frame.
The manner of fastening the ribs to the frame pieces is
optional. In some cases they are lashed with shoe
thread, and in others clamped with a metal clamp fastened
with 1/2-inch wood screws. Where clamps and
screws are used care should be taken to make slight
holes in the wood with an awl before starting the screws
so as to lessen any tendency to split the wood. On the