Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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trary, the Tide is the cauſe of them, that is, of bringing them
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into the brains more apt for loquacity and oſtentation, than for
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the ſpeculation and diſcovering of the more abſtruſe ſecrets of
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Nature; which kind of people, before they can be brought to
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prononnce that wiſe, ingenious, and modeſt ſentence,
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I know it
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not,
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ſuffer to eſcape from their mouths and pens all manner of
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travagancies. </
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>And the onely obſerving, that the ſame Moon, and
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the ſame Sun operate not with their light with their motion, with
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great heat, or with temperate, on the leſſer reeeptaces of Water,
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but that to effect their flowing by heat, they muſt be reduced to
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little leſſe than boiling, and in ſhort, we not being able artificially
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to imitate any way the motions of the Tide, ſave only by the
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tion of the Veſſel, ought it not to ſatisfie every one, that all
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the other things alledged, as cauſes of thoſe eſſects, are
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vaine fancies, and altogether eſtranged from the Truth. </
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ſay, therefore, that if it be true, that of one effect there is but
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one ſole primary cauſe, and that between the cauſe and effect,
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there is a firm and conſtant connection; it is neceſſary that
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ſoever there is ſeen a firm and conſtant alteration in the effect,
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there be a firm and conſtant alteration in the cauſe. </
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<
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>And
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cauſe the alterations that happen in the ebbing and flowing in
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ſeveral parts of the Year and Moneths, have their periods firm and
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conſtant, it is neceſſary to ſay, that a regular alteration in thoſe
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ſame times happeneth in the primary cauſe of the ebbings and
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flowings. </
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>And as for the alteration that in thoſe times happens
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in the ebbings and flowings conſiſteth onely in their greatneſs;
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that is, in the Waters riſing and falling more or leſſe, and in
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running with greater or leſſe
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impetus
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; therefore it is neceſſary,
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that that which is the primary cauſe of the ebbing and flowing,
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doth in thoſe ſame determinate times increaſe and diminiſh its
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force. </
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>But we have already concluded upon the inequality and
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irregularity of the motion of the Veſſels containing the Water to
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be the primary cauſe of the ebbings and flowings. </
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<
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>Therefore
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it is neceſſary, that that irregularity, from time to time,
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ſpondently grow more irregular, that is, grow greater and leſſer.
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>Now it is requiſite, that we call to minde, that the irregularity,
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that is, the different velocity of the motions of the Veſſels, to
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wit, of the parts of the Terreſtrial Superficies, dependeth on
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their moving with a compound motion, reſulting from the
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mixtion of the two motions, Annual and Diurnal, proper to the
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whole Terreſtrial Globe; of which the Diurnal converſion, by
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one while adding to, and another while ſubſtracting from, the
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Annual motion, is that which produceth the irregularity in the
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compound motion; ſo that, in the additions and ſubſtractions,
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that the Diurnal revolution maketh from the Annual motion, </
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