ering apparatus. Two boards, F F, each 11 feet long, 8
inches wide, 7/8-inch thick, are planed, and the edges matched together,
at the stern. They are nailed to the plank, A, and the cross-bars, E E,
as shown in Fig. 2. Four blocks, each 3 inches thick, must be put under
them where they lie over the cross-bars. A board a foot long, 7/8-inch
thick, must also be put under F F at the stern.

Six slats, G G, as long as may be needed, 2 inches wide, 7/8-inch thick,
are nailed over A, and under F F.

The mast is a natural spruce stick, 13 feet long, shaved down to 3-1/2
inches at butt, 2-1/2 inches at the top.

The boom is 13-1/2 feet long, 2 inches thick at each end, and a little
thicker in the middle. It is fastened to the mast by an iron eye,
screwed into the mast, and a hook in the end of the boom. The sprit is
10 feet long, 1-1/2 inches diameter, shaved to 3/4-inch for 2 inches at
each end.

The iron collar, _i_, through which the mast is inserted loosely, stands
two feet above the top of plank, A. It is supported by three iron
braces, _h h h_, and is bolted to the tops of them. The braces are
3/4-inch round iron, and bolted to the frame as shown.

[Illustration: Fig. 3.]

The hind-runner block, C, is fastened to A by a strong iron, _m_, as
shown in Fig. 1. It allows the runner to rock up and down, and to be
turned sidewise by the tiller. A must be plated with iron top and bottom
where _m_ goes through, that the runner may not "wobble."

The construction of the runners, J J J, must be attended to with the
greatest care, as upon these, in a great measure, will depend the
success of your boat. Get a square bar of cast steel, 6 feet long, cut
off 22 inches for third runner, and divide the rest in halves, across.
Shape two forward runners and one hind one as shown in Fig. 1. The
bearing surface is a right-angled edge, as shown in Fig. 3. This sharp
edge holds the ice firmly without much friction. Holes are bored two
inches up into the cross-bars, near their ends, and the runners driven
in and fastened with rivets. After the runners are forged, they should
be finished with a file and emery paper if not perfectly smooth. The
front turn must be long and gradual like a skate, two-thirds the length,
however, flat on the ice. The running edges should not be too sharp.
They will project 2-1/2 or three inches below the bottom of the wood.

For the sail get twenty yards, three-quarters of a yard wide, of heavy
drilling. The