our ends outward and remove the contents, wash clean and dry
and then bend the four ends inward, leaving a hole about 3/4 in.
in diameter in the center. Drop in a piece of bread and lay the
can down upon its side and the trap is ready for use. The mouse
can get in but he cannot get out.
--Contributed by E. J. Crocker, Victor, Colo.

** Finishing Aluminum [198]

Rubbing the surface of an aluminum plate with a steel brush will
produce a satin finish.

** How to Make a Sailing Canoe [199]

A canvas canoe is easily made and light to handle, but in making
one, it must be remembered that the cloth will tear, if any snags
are encountered. Therefore such a craft cannot be used in all
waters, but by being careful at shores, it can be used as safely
as an ordinary sailing canoe. Be sure to select the best materials
and when complete cover the seams well with paint.

[Illustration: Completed Sailing Canoe]

The materials necessary for the construction of a sailing canoe,
as illustrated in the engraving, are as follows:

1 keelson, 1 in. by 8 in. by 15 ft., selected pine.
14 rib bands, 1 in. square by 16 ft., clear pine.
2 gunwales, 1 in. by 2 in. by 16 ft.
1 piece for forms and bow pieces, 1 in. by 12 in. by 10 ft.
4 outwales, 1/4 in. by 2 in. by 16 ft.
1 piece, 3 in. wide and 12 ft. long, for cockpit frame.
1 piece, 2 in. wide and 12 ft. long, for center deck braces.
11 yd. of 1-1/2-yd. wide 12-oz. ducking.
8 yd. of 1-yd. wide unbleached muslin.
50 ft. of rope.
1 mast, 9 ft. long.
Paint, screws and cleats.

The keelson, Fig. 1, is 14 ft. long, 8 in. wide in the center and
tapered down from a point 4 ft. from each end to 1 in. at the
ends. Both ends are mortised, one 6 in. for the stern piece, and
the other 12 in. for the bow. Be sure to get the bow and stern
pieces directly in the middle of the keelson and at right angles
with the top edge. The stern and bow pieces are cut as shown in
Fig. 2 and braced with an iron band, 1/8 in. thick and 3/4 in.
wide, drilled and fastened with screws.

Study the sketches showing the details well before starting to cut
out the pieces. Then there will be no trouble experienced later in
putting the parts together. See that all the pieces fit their
places as the work proceeds and apply the canvas with care.

Two forms are made as shown in Figs. 3 and 4; the smaller is
placed 3 ft. from the bow and the large one, 7 ft. 3 in. fro