m
piece of the boat is thin.

[Illustration: FIG. 93]

[Illustration: FIG. 92]

The two dry batteries for the motor are held in two tin troughs, as
illustrated in Fig. 92. These troughs are fastened to the side of the
boat by means of small bolts. They will prevent the boat from shifting
its cargo; in other words, they hold the batteries in place and thereby
prevent the boat from listing.

The deck and deck fittings should now be furnished. The construction of
the forward cabin is shown in Fig. 93. The sides and back are formed
with cigar-box wood, while the curved front can best be made with a
piece of tin. The top is also cut to shape from cigar-box wood, and
should overlap about 1/4 inch. The pilot-house is simplicity itself,
being made of a piece of curved tin with three windows cut in it. Four
little lugs cut in the tin are bent on the inside and each provided with
a hole. These lugs are used to tack the pilot-house to the deck. A small
skylight is produced from a solid piece of wood and tacked in place as
illustrated in the drawing.

The builder is cautioned not to destroy the appearance of his boat by
making the mast too large. After the mast has been nicely sandpapered, a
little wire frame is bent to shape and fastened to the top, as shown in
Fig. 87. The little wire railing that is placed in front of the mast is
then bent to shape, and this and the mast are put in their permanent
position. The mast can be held to the deck by boring a hole a little
under size and smearing the bottom of the mast with a little glue before
it is forced in. Pieces of black thread are run from the top of the mast
to the railing at the bottom, as shown. These threads are used to hoist
signal flags. Two little angle-pieces are placed on the forward deck,
one on each side of the pilot-house. These are for the harbor lights.
One should be painted green and one red.

This finishes the forward cabin. It should be placed in the center of
the deck and the position it occupies should be marked out with a
pencil. This portion of the deck should be carefully cut out with a
coping-saw. The cabin is then forced into the opening. The fit should be
fairly tight, so that it will not be necessary to employ nails or glue,
as this is the only way in which the interior of the hull is made
accessible.

Two ventilators are placed just back of the forward cabin. Between the
forward cabin and the cabin aft there is placed a rapid-fire gun. The
det