They should reach the ear simultaneously, or nearly so, from either bank.
On the same principle, vessels have been steered out of danger when
caught by a dense fog close to a rocky coast.
Awning.--The best is a wagon-roof awning, made simply of a couple of
parallel poles, into which the ends of the bent ribs of the roof are set,
without any other cross-pieces. This roof should be of two feet larger
span than the width of the boat, and should rest upon prolongations of
the thwarts, or else upon crooked knees of wood. One arm of each of the
knees is upright, and is made fast to the inside of the boat, while the
other is horizontal and projects outside it: it is on these horizontal
and projecting arms that the roof rests, and to which it is lashed. Such
an awning is airy, roomy, and does not interfere with rowing if the
rowlocks are fixed to the poles. It also makes an excellent cabin for
sleeping in at night.
Sail Tent.--A boat's sail is turned into a tent by erecting a
gable-shaped framework: the mast or other spar being the ridge-pole, and
a pair of crossed oars lashed together supporting it at either end; and
the whole is made stable by a couple of ropes and pegs. Then the sail is
thrown across the ridge-pole (not over the crossed loops of the oars, for
they would fret it), and is pegged out below. The natural fall of the
canvas bends to close the two ends, as with curtains.
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