detail with the measurements as
they are plainly shown in the sketches. The backbone is 37-1/2 ft.
over all, 12 in. in the center, 5 in. stern, 3-1/2 in. at the
nose; width 4-1/2 in. All wood should be selected from the best
grades, well seasoned and free from checks. In Fig. 1 is shown the
complete ice-yacht with general dimensions for the sail and main
parts. Other dimensions are shown in Fig-, 2. The backbone is
capped on the upper and lower edges full length with strips of
oak, 4-1/4 in. wide and 5/8 in. thick. The lengthwise side strips
of spruce are 1-1/4 in. thick. The filling-in pieces placed
between the side pieces are of seasoned white pine, leaving the
open places as shown in Fig. 2. The parts are put together with
hot glue and brass screws.

The runner plank should be placed

[Illustration: Details of the Ice-Yacht Parts]

with the heart of the wood up, so as to give the natural curve
from the ice so that it will act as a spring. The plank is 16 in.
wide in the center, 14 in. at the ends; 4-1/8 in. thick at the
center and 2-3/4 in. at the ends.

Details of the runners are shown in Figs. 3, 4, 5, 6, 7, 8 and 9.
The cast iron shoes are filed and finished with emery paper,
making the angle on the cutting edge 45 deg. on both sides. The
runners are 7-1/4 in. wide over all and 2-1/8 in. thick. The soft
iron casting is 2-1/4 in. deep. The shoes are fastened by 5/8-in.
machine bolts. These are shown in Figs. 3 and 9. The rudder is
2-3/4 in. thick, 5 in. deep, including wood and iron, and 3 ft.
long. The cast iron shoe is 1-7/8 in. deep and fastened on with
four 1/2-in. machine bolts. A brass plate, 1/4 in. thick, 2 in.
wide and 7 in. long, is inserted on each side of the runners as
shown in Fig. 9. Three holes are drilled through for a 3/4-in.
riding bolt that can be shifted as desired for rough or smooth
ice. The runner chocks and guides are 1-7/8 in. thick and 4-1/2
in. deep. They are set in the runner plank 1/4 in. and fastened
with glue and 1/2-in. lag screws. These are shown in Figs. 6 and
7.

The aft cockpit is stationary, while the fore or passenger cockpit
can be removed at will. Both cockpits are the same size, 42 in.
wide and 7 ft. long over all. Each one has a bent rail, 1-1/2 in.
by 4 in., grooved 1/2 in. by 7/8 in. before bending. The flooring
is of oak, 1-1/2 in. thick and 4 in. wide, tongue-and grooved. The
forward cockpit is made in halves and hung on the backbone with
wrought-iron straps