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

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1
^{*} 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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