account use nail, tack, or screw. Attach
the vertical masts and the horizontal ones about to be described by gluing
and binding lightly with thread, or by neatly glued strips of the Hart's
fabric used for the planes.

Horizontal Spars, etc.--To consider now the horizontal section or part
plan of the model, from which, to avoid confusion, details of most vertical
parts are omitted. Referring to Fig. 133, it will be seen that we have
three horizontal masts or spars--HS1, 4 inches; HS2, 6 inches; and HS3,
slightly over 12 inches long. The last is well steamed, slightly curved and
left to dry while confined in such a manner as to conform to the required
shape. It should so remain at least twenty-four hours before being fixed to
the model. All the spars are attached by glue and neat cross bindings. If
the central rod be of triangular instead of T section, the join can be made
more neatly. The same remarks apply to the two 9 and 10 inch struts at the
propeller end of the rod, which have to withstand the pull of the rubber
motor on PPl. These two pieces will have a maximum strength and minimum
weight if of the T section used for the rod. If the work is done carefully,
1/4 inch each way will be sufficient.

Main Plane and Elevator.--The framework of each plane is simply four
strips of satin walnut or other suitable wood, 1/4 inch broad and 1/16 inch
or even less in thickness for the main plane, and about 1/16 by 1/16 inch
for the elevator. These strips are first glued together at the corners and
left to set. The fabric (Hart's fabric or some similar very light material)
is then glued on fairly tight--that is, just sufficiently so to get rid of
all creases. The main plane is then fixed flat on to the top of the central
rod by gluing and cross binding at G and H. (A better but rather more
difficult plan is to fasten the rectangular frame on first and then apply
the fabric.) The same course is followed in dealing with the elevator,
which is fixed, however, not to the rod, but to the 4-inch horizontal spar,
HS1, just behind it, in such a manner as to have a slight hinge movement at
the back. This operation presents no difficulty, and may be effected in a
variety of ways. To set the elevator, use is made of the short vertical
mast, M1. A small hole is pierced in the front side of the elevator frame
at Z, and through this a piece of thin, soft iron wire is pushed, bent
round the spar, and tied. The other end of the wire is taken forw