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

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SALV. Well ſaid you hitherto, for perhaps it may anon change
countenance.
And that I may no longer hold you in ſuſpenſe,
tell me, Simplicius, do you really believe, that the Experiment of
the ſhip ſquares ſo very well with our purpoſe, as that it ought to
be believed, that that which we ſee happen in it, ought alſo to
evene in the Terreſtrial Globe?
SIMPL. As yet I am of that opinion; and though you have
alledged ſome ſmall diſparities, I do not think them of ſo great
moment, as that they ſhould make me change my judgment.
SALV. I rather deſire that you would continue therein, and
hold for certain, that the effect of the Earth would exactly anſwer
that of the ſhip: provided, that when it ſhall appear prejudicial to
your cauſe, you would not be humorous and alter your thoughts.
You may haply ſay, Foraſmuch as when the ſhip ſtands ſtill, the
ſtone falls at the foot of the Maſt, and when ſhe is under ſail, it
lights far from thence, that therefore by converſion, from the ſtones
falling at the foot is argued the ſhips ſtanding ſtill, and from its
falling far from thence is argued her moving; and becauſe that
which occurreth to the ſhip, ought likewiſe to befall the Earth:
that therefore from the falling of the ſtone at the foot of the
er is neceſſarily inferred the immobility of the Terreſtrial Globe.
Is not this your argumentation?
SIMPL. It is; and reduced into that conciſeneſs, as that it is
become moſt eaſie to be apprehended.
SALV. Now tell me; if the ſtone let fall from the
top, when the ſhip is in a ſwift courſe, ſhould fall exactly in
the ſame place of the ſhip, in which it falleth when the ſhip is at
anchor, what ſervice would theſe experiments do you, in order to
the aſcertaining whether the veſſel doth ſtand ſtill or move?
SIMPL. Juſt none: Like as, for exemple, from the beating of
the pulſe one cannot know whether a perſon be aſleep or awake,
ſeeing that the pulſe beateth after the ſame manner in ſleeping as
in waking.
SALV. Very well. Have you ever tryed the experiment of the
Ship?
SIMPL. I have not; but yet I believe that thoſe Authors
which alledg the ſame, have accurately obſerved it; beſides that
the cauſe of the diſparity is ſo manifeſtly known, that it admits
of no queſtion.
SALV. That it is poſſible that thoſe Authors inſtance in it,
without having made tryal of it, you your ſelf are a good
mony, that without having examined it, alledg it as certain, and in
a credulous way remit it to their authority; as it is now not onely
poſſible, but very probable that they likewiſe did; I mean, did
remit the ſame to their Predeceſſors, without ever arriving at one

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