When we have a system of resistance to the sea,
anchored and facing a certain direction, and consequently not being able
to revolve around its axis as vessels do, care must be taken not to give
it entire surfaces.
[Illustration: FIG. 4.--FROIDEVILLE'S BREAKWATER.--MODE OF JOINING THE
PARTS.]
Mr. Froideville's breakwater consists of a framework 25 meters in length,
and 9 in height and width, and having the form of an irregular 5-sided
prism (Fig. 3). The smallest side of the prism is designed to serve as a
flat keel. The axis is formed of a metallic float, from whence start radii
that form the skeleton of the framework, and that are designed for
connecting the center with five long spruce beams that form the angles of
the prism. To these beams are affixed the cross pieces that form the
openwork sides. Five long pieces of wood parallel with the beams, but not
so strong as they, protect the cross pieces and secure them against
breakage in the middle. All the angles of the breakwater and all points of
juncture of the pieces are protected with iron, and it is in order to
counterbalance the weight of all this iron that the central float is
used. Parallel with this first breakwater, there are two other and smaller
ones, which are designed for reducing the effect of rolling as much as
possible.
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