Further, the mode of construction of the semi-vessels--both ends of
which are of a similar pattern--allows of their being navigated up and
down a water channel without the necessity of turning them round;
provision having also been made for the fixing of the rudder at either
end, which would therefore merely require exchanging. This is of some
advantage in narrow river beds and canals, and applies equally to the
duplex vessel as to the single semi-vessels.
[Illustration: FIG. 1.]
[Illustration: FIG. 2.]
[Illustration: FIG. 3.]
[Illustration: FIG. 4.]
[Illustration: FIG. 5.]
Each semi-barge on its part is also constructed of two equal
halves--which are, however, inseparable--and as there is no distinct
stem or stern, any one of these semi-vessels will fit any other
semi-vessels of the same dimensions, and can be attached to the same
by means of the coupling apparatus, and the two "folded up" into one
duplex vessel. This process does not present any material
difficulties. The two single boats on being coupled together can be
made to lean over toward each other, by filling their lateral water
compartments, to such an extent that the further closing up can be
easily effected by means of specially constructed windlasses.
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