Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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motions, by making them different in the times of the
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ſtices, as to greatneſſe, from what they are in the Equinoxes.</
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>We will ſpeak (in the firſt place, of the diurnal motion, as
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being the principal, and upon which the Moon and Sun ſeem to
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exerciſe their power ſecondarily, in their monethly and annual </
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alterations. </
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<
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>Three differences are obſervable in theſe horary
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mutations; for in ſome places the waters riſe and fall, without
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making any progreſſive motion; in others, without riſing or
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ling they run one while towards the Eaſt, and recur another
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while towards the Weſt; and in others they vary the heights
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and courſe alſo, as happeneth here in
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Venice,
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where the Tides in
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coming in riſe, and in going out fall; and this they do in the
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termities of the lengths of Gulphs that diſtend from Weſt to
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Eaſt, and terminate in open ſhores, up along which ſhores the
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Tide at time of flood hath room to extend it ſelf: but if the
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courfe of the Tide were iutercepted by Cliffes and Banks of
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great height and ſteepneſſe, there it will flow and ebbe without
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any progreſſive motion. </
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<
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>Again, it runs to and again, without
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changing height in the middle parts of the Mediterrane, as
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bly happeneth in the ^{*}
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Faro de Meſſina,
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between
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Scylla
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and
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rybdis,
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where the Currents, by reaſon of the narrowneſſe of
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the Channel, are very ſwift; but in the more open Seas, and
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about the Iſles that ſtand farther into the Mediterranean Sea, as
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the
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Baleares, Corſica, Sardignia, ^{*} Elba, Sicily
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towards the
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Affrican
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Coaſts,
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Malta, ^{*} Candia, &c.
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the changes of watermark are
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very ſmall; but the currents indeed are very notable, and
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cially when the Sea is pent between Iſlands, or between them
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and the Continent.</
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Varieties that
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happen in the
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nal period.
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* A Strait, ſo
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called.</
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* Or Ilva.</
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* Or Creta.</
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>Now theſe onely true and certain effects, were there no more
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to be obſerved, do, in my judgment, very probably perſwade
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any man, that will contain himſelf within the bounds of
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ral cauſes, to grant the mobility of the Earth: for to make the
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veſſel (as it may be called) of the Mediterrane ſtand ſtill, and to
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make the water contained therein to do, as it doth, exceeds my
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imagination, and perhaps every mans elſe, who will but pierce
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beyond the rinde in theſe kind of inquiries.</
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<
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>SIMP. </
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>Theſe accidents,
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Salviatus,
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begin not now, they are
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moſt ancient, and have been obſerved by very many, and ſeveral
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have attempted to aſſigne, ſome one, ſome another cauſe for the
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ſame: and there dwelleth not many miles from hence a famous
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Peripatetick, that alledgeth a cauſe for the ſame newly fiſhed out
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of a certain Text of
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Ariſtotle,
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not well underſtood by his
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poſitors, from which Text he collecteth, that the true cauſe of
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theſe motions doth only proceed from the different profundities
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of Seas: for that the waters of greateſt depth being greater in </
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