Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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no cauſe of ebbing and flowing, ſave onely by the participation
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of another Sea, wherewith it hath communication, that is
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ject to great
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The cauſe why
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ſome Seas, though
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very long, ſuffer
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no ebbing and
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flowing.
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Ebbings and
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flowings why
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teſt in the
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mities of gulphs,
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and leaſt in the
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middle parts.
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>In the fourth place we ſhall very eaſily find out the reaſon
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why the fluxes and refluxes are greateſt, as to the waters riſing
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and falling in the utmoſt extremities of Gulphs, and leaſt in the
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intermediate parts; as daily experience ſheweth here in
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Venice,
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lying in the farther end of the
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Adriatick
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Sea, where that
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rence commonly amounts to five or ſix feet; but in the places
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of the Mediterrane, far diſtant from the extreams, that
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on is very ſmall, as in the Iſles of
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Corſica
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and
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Sardinnia,
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and
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in the Strands of
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Rome
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and
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Ligorne,
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where it exceeds not half a
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foot; we ſhall underſtand alſo, why on the contrary, where
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the riſings and fallings are ſmall, the courſes and recourſes are
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great: I ſay it is an eaſie thing to underſtand the cauſes of theſe
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accidents, ſeeing that we meet with many manifeſt occurrences
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of the ſame nature in every kind of Veſſel by us artificially
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poſed, in which the ſame effects are obſerved naturally to
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low upon our moving it unevenly, that is, one while faſter, and
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another while ſlower.</
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Why in narrow
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places the courſe
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of the waters is
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more ſwift than in
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larger.
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>Moreover, conſidering in the fifth place, that the ſame
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quantity of Water being moved, though but gently, in a ſpatious
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Channel, comming afterwards to go through a narrow paſſage,
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will of neceſſity run, with great violence, we ſhall not finde it hard
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to comprehend the cauſe of the great Currents that are made
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in the narrow Channel that ſeparateth
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Calabria
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from
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Sicilia:
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for that all the Water that, by the ſpaciouſneſſe of the Iſle,
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and by the
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Ionick
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Gulph, happens to be pent in the Eaſtern
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part of the Sea, though it do in that, by reaſon of its largeneſs,
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gently deſcend towards the Weſt, yet nevertheleſſe, in that it
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is pent up in the
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Boſphorus,
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it floweth with great violence
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tween
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Scilla
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and
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Caribdis,
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and maketh a great agitation. </
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>Like to
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which, and much greater, is ſaid to be betwixt
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Africa
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and the
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great Iſle of St.
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Lorenzo,
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where the Waters of the two vaſt
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Seas,
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Indian
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and
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Ethiopick,
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that lie round it, muſt needs be
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ſtraightned into a leſſe Channel between the ſaid Iſle and the
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Ethiopian
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Coaſt. </
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<
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>And the Currents muſt needs be very great
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in the Straights of
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Magellanes,
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which joyne together the
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vaſt Oceans of
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Ethiopia,
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and
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Del Zur,
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called alſo the
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Pacifick
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Sea.</
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A diſcuſſion of
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ſome more abſtruſe
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accidents obſerved
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in the ebbing and
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flowing.
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>It follows now, in the ſixth place, that to render a reaſon of
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ſome more abſtruſe and incredible accidents, which are
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ved upon this occaſion, we make a conſiderable reflection upon
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the two principal cauſes of ebbings and flowings, afterwards
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compounding and mixing them together. </
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<
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