Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667

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{*} Lizza-Fuſina, laden with freſh water, for the ſervice of the City.
Let us therefore fancy one of thoſe Barks, to come from thence
with
moderate velocity along the Lake, carrying the water gently,
of
which it is full: and then either by running a ground, or by
ſome
other impediment that it ſhall meet with, let it be notably
retarded
.
The water therein contained ſhall not, by that means,
loſe
, as the Bark doth, its pre-conceived impetus, but retaining
the
ſame, ſhall run forwards towards the prow, where it ſhall
riſe
notably, falling as much a ſtern.
But if, on the contrary,
the
ſaid Bark, in the midſt of its ſmooth courſe, ſhall have a new
velocity
, with notable augmentation added to it, the water
tained
before it can habituate it ſelf thereto, continuing in its
tardity
, ſhall ſtay behinde, namely a ſtern, where of
quence
it ſhall mount, and abate for the ſame at the prow.
This
effect
is undoubted and manifeſt, and may hourly be
ted
; in which I deſire that for the preſent three particulars may
be
noted.
The flrſt is, that to make the water to riſe on one
ſide
of the veſſel, there is no need of new water, nor that it run
thither
, forſaking the other ſide.
The ſecond is, that the water
in
the middle doth not riſe or fall notably, unleſſe the courſe of
the
Bark were not before that very ſwift, and the ſhock or other
arreſt
that held it exceeding ſtrong and ſudden, in which caſe its
poſſible
, that not only all the water might run forwards, but
that
the greater part thereof might iſſue forth of the Bark: and
the
ſame alſo would enſue, whilſt that being under ſail in a
ſmooth
courſe, a moſt violent impetus ſhould, upon an inſtant,
overtake
it: But when to its calme motion there is added a
derate
retardation or incitation, the middle parts (as I ſaid)
obſervedly
riſe and fall: and the other parts, according as they
are
neerer to the middle, riſe the leſſe; and the more remote,
more
.
The third is, that whereas the parts about the midſt do
make
little alteration in riſing and falling, in reſpect of the
ters
of the ſides; on the contrary, they run forwards and
wards
very much, in compariſon of the extreams.
Now, my
Maſters
, that which the Bark doth, in reſpect of the water by it
contained
, and that which the water contained doth, in
ſpect
of the Bark its container, is the ſelf-ſame, to an hair, with
that
which the Mediterranean Veſſel doth, in reſpect of the
ters
in it contained, and that which the waters contained do, in

reſpect
of the Mediterranean Veſſel their container.
It
eth
now that we demonſtrate how, and in what manner it is true,
that
the Mediterrane, and all the other Straits; and in a word,
all
the parts of the Earth do all move, with a motion notably
uneven
, though no motion that is not regular and uniforme, is
thereby
aſſigned to all the ſaid Globe taken collectively.

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