Alberti, Leone Battista, Architecture, 1755

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1paſs by theſe Diſputes, and proceed to ſhew
that
there are two Things by Means of which
the
Art of Building may contribute to the
Saſety
and Victory of Generals of Fleets and
their
Forces: The Firſt conſiſts in the right
Conſtruction
and Rigging of the Veſſels, and
the
Second in the proper fortifying the Haven;
whether
you are to go to attack the Enemy,
or
to ſtay to defend yourſelf.
The primary
Uſe
of Shipping is to convey you and yours:
The
Second, is to fight without Danger.
The
Danger
muſt ariſe either from the Ships them­
ſelves
, in which Caſe it ſeems to be innate and
incorporate
with them; or elſe muſt happen to
them
from without.
That from without, is
from
the Force and Violence of Winds and
Waves
, from Rocks and Shelves; all which are
to
be avoided by Experience in Sea-affairs, and
a
thorough Knowledge of Places and Winds:
But
the Danger incorporate and innate with
the
Veſſel itſelf, ariſes either from the Deſign,
or
the Timbers; againſt which Defects it falls
under
our Province to provide.
We ſhould
reject
all Timber that is brittle, or apt to ſplit,
too
heavy or liable to rot ſoon.
Nails and Pins
of
Braſs or Copper, are reckoned better than
thoſe
of Iron.
I have obſerved by Means of
Trajan's Ship, which while I was writing this
Treatiſe
was dug up out of the lago di Nemi,
where
it had lain under Water above thirteen
hundred
Years, that the Pine and Cypreſs
Wood
which was in it had remained ſurpriz­
ingly
ſound.
It was covered on the Outſide
with
double Planks, done over with Greek
Pitch
, to which ſtuck a Coat of Linen Cloth,
and
that again was plated over with Sheets of
Lead
faſtened on with braſs Nails.
The anci­
ent
Architects took the Model of their Ships
from
the Shape of a Fiſh; that Part which
was
the Back of the Fiſh, in the Ship was the
Keel
; that which in the Fiſh was the Head,
in
the Ship was the Prow; the Tail was the
Helm
, and inſtead of Fins and Gills, they made
Oars
.
Ships are of two Sorts, and are built
either
for Burthen or for Speed: A long Veſ­
ſel
cuts its Way quickeſt through the Water,
eſpecially
when it Sails before the Wind; but
a
ſhort one is moſt obedient to the Helm.
I
would
not have the Length of a Veſſel of Bur­
then
leſs than three Times its Breadth; nor
that
of a Veſſel for Speed, more than nine
Times
.
We have treated more particularly of
every
Thing relating to a Veſſel in a Book in­
tended
wholly for that Purpoſe, called the
Ship
; and therefore ſhall have Occaſion to ſay
no
more of it here, than what is juſt neceſſary.
The Parts of a Ship are theſe, the Keel, the
Poop
, the Prow, the two Sides, to which you
may
, if you pleaſe, add the Sail, the Helm,
and
the Reſt of the Parts that belong to the
Courſe
of the Ship.
The Hollow of the Veſſel
will
bear any Weight that is equal to the
Weight
of Water that would fill it quite up to
the
Top.
The Keel muſt be ſtraight, but all
the
other Parts made with curve Lines.
The
broader
the Keel is, the greater Weight the
Veſſel
will carry, but then it will be the ſlow­
er
; the narrower the Keel is, the Swiſter will
be
the Ship, but then it will be unſteady, un­
leſs
you fill it with Ballaſt.
The broad Keel is
moſt
convenient in ſhallow Water; but in deep
Seas
the narrow one will be more ſecure.
The
Sides
and Prow built high will make the ſtout­
eſt
Reſiſtance againſt the Waves, but then
they
are more expoſed to Danger from the
Winds
; the Sharper the Head is, the Swifter
the
Ship will make its Way; and the Thinner
the
Stern, the more Steady will be the Veſſel
in
its Courſe.
The Sides of the Ship towards
the
Head ought to be very ſtout, and a little
Swelling
outwards to throw off the Waves
when
it ploughs through the Water both with
Sails
and Oars; but towards the Stern they
ſhould
grow narrower, in order to ſlip through
the
Waves with the more Eaſe.
A Number
of
Helms adds Firmneſs to the Veſſel, but takes
off
from its Swiftneſs.
The Maſt ſhould be as
long
as the whole Ship.
We ſhall not here
deſcend
to other minute Particulars neceſſary
both
to the Way and Defence of the Veſſel,
ſuch
as Oars, Ropes, ſharp Beaks, Towers,
Bridges
and the like; but ſhall only obſerve,
that
the Planks and Timbers which hang
down
by the Sides and ſtick out by the Beak
of
the Veſſel, will ſerve inſtead of a Fortifica­
tion
againſt the Attacks of the Enemy as will
Poles
ſtuck upright, inſtead of Towers, and
the
Boom, or the Skiff laid over the Boom, in­
ſtead
of Bridges.
The Ancients uſed in the
Prow
of their Ships to place a military En­
gine
, which they called a Corvus: But our
Mariners
now in the Head and Stem of their
Veſſels
near the Maſts have learnt to ſet up
Towers
, which they fence round with old
coarſe
Cloths, Ropes, Sacks, and the like, to
deaden
the Force of any Violence that might
attack
them; and to keep off any Enemy that
ſhould
attempt to board them, they ſet up a
Fence
of Net-work.
I have in another Place
contrived
and ſhewn how the Floor of the Ship

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