Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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tions; the one is its riſing and falling alternately towards the
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one and other extremity; the other is its moving and running, to
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ſo ſpeak, Horizontally forwards and backwards. </
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>Which two
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ferent motions differently reſide in divers parts of the Water:
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for its extream parts are thoſe which moſt eminently riſe and fall;
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thoſe in the middle never abſolutely moving upwards and
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wards, of the reſt ſucceſſively thoſe that are neereſt to the
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treams riſe and fall proportionally more than the remote: but on
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the contrary, touching the other progreſſive motion forwards
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and backwards, the middle parts move notably, going and
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turning, and the waters that are in the extream parts gain no
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ground at all; ſave onely in caſe that in their riſing they
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flow their banks, and break forth of their firſt channel and
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ceptacle; but where there is the obſtacle of banks to keep them
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in, they onely riſe and fall; which yet hindereth not the waters
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in the middle from fluctuating to and again; which likewiſe
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the other parts do in proportion, undulating more or leſſe,
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according as they are neerer or more remote from the
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Water riſeth &
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falleth in the
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tream parts of the
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Veſſel, and runneth
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to and fro in the
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midst.
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An accident of
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the Earths motions
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impoſſible to be
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duced to practice
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by art.
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>The fifth particular accident ought the more attentively to be
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conſidered, in that it is impoſſible to repreſent the effect
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of by an experiment or example; and the accident is this. </
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>In
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the veſſels by us framed with art, and moved, as the
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named Bark, one while more, and another while leſſe ſwiftly,
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the acceleration and retardation is imparted in the ſame manner
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to all the veſſel, and to every part of it; ſo that whilſt
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v. </
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the
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Bark forbeareth to move, the parts precedent retard no more
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than the ſubſequent, but all equally partake of the ſame
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tardment; and the ſelf-ſame holds true of the acceleration,
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namely, that conferring on the Bark a new cauſe of
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ter velocity, the Prow and Poop both accelerate in one and
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the ſame manner. </
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>But in huge great veſſels, ſuch as are the very
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long bottomes of Seas, albeit they alſo are no other than
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tain cavities made in the ſolidity of the Terreſtrial Globe,
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it alwayes admirably happeneth, that their extreams do not
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unitedly equall, and at the ſame moments of time increaſe
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and diminiſh their motion, but it happeneth that when one of its
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extreames hath, by vertue of the commixtion of the two
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Motions, Diurnal, and Annual, greatly retarded its velocity,
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the other extream is animated with an extream ſwift motion.
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>Which for the better underſtanding of it we will explain,
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ſuming a Scheme like to the former; in which if we do but
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poſe a tract of Sea to be long,
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v. </
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<
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a fourth part, as is the arch
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B C [
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in Fig.
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2.] becauſe the parts B are, as hath been already
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declared, very ſwift in motion, by reaſon of the union of the
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two motions diurnal and annual, towards one and the ſame way, </
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