Castelli, Benedetto
,
Of the mensuration of running waters
,
1661
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difficulty proceedeth from the waters of
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Fiume morto
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being low,
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and the fields drained.</
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>4. As to the particular of the Cauſes that you tell me men
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preſs ſo much unto the moſt
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Serene Grand Duke,
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and to the
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Prince, I have not much to ſay, becauſe it is not my profeſſion;
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nor have I conſidered of the ſame: Yet I believe, that when the
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Prince and his Highneſſe ſee the benefit of his People and Sub
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jects in one ſcale of the Ballance, and the accomodation of
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Huntſmen in the other, his Highneſſe will incline to the profit
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of his ſubjects; ſuch have I alwayes found his Clemency and
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Nobleneſſe of minde. </
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>But if I were to put in my vote upon
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this buſineſſe, I would ſay, that the points of Spears, and the
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mouths of Guns, the yelping of Dogs, the wilyneſſe of Huntſ
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men, who run thorow and narrowly ſearch all thoſe Woods,
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Thickets and Heathes, are the true deſtroyers of Bucks and
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Boares, and not a little Salt-water, which ſetleth at laſt in ſome
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low places, and ſpreadeth not very far. </
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>Yet nevertheleſſe, I will
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not enter upon any ſuch point, but confine my ſelf ſolely to the
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buſineſſe before me.</
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>5. That Experiment of joyning together the water of
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Fiume
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morto,
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and that of
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Serchio
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by a little trench to ſee what advan
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tage the Level E hath upon the Level I, doth not give me full
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ſatisfaction, taken ſo particularly, for it may come to paſſe, that
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ſometimes E may be higher, and ſometimes A lower, and I do
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not queſtion but that when
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Serchio
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is low, and
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Fiume morto
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full
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of Water, the level of
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Fiume morto
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will be higher than that of
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Serchio.
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But
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Serchio
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being full, and
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Fiume morto
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ſcant of Wa
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ter, the contrary will follow, if the Mouth ſhall be opened to
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the Sea. </
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>And here it ſhould ſeem to me, that it ought to be
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conſidered, that there is as much advantage from E to the Sea
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through the little Trench opened anew into
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Serchio,
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as from E to
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the Sea by the Mouth of
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Fiume morto.
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But the difficulty (which
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is that we are to regard in our caſe) is, that the courſe of the
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Waters thorow the Trench is three times longer than the courſe
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of the Mouth of
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Fiums morto,
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as appeareth by the Draught or
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Plat which you ſent me, which I know to be very exactly drawn,
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for that the ſituation of thoſe places are freſh in my memory.
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>Here I muſt give notice, that the waters of
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Fiume morto
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determi
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ning thorow the Trench in
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Serchio
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(the waters of which
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Fiume
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morto
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are, for certain, never ſo low as the Sea) their pendency or
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declivity ſhall, for two cauſes, be leſſe than the pendency of thoſe
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waters through the Mouth towards the Sea, that is, becauſe of
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the length of the line through the Trench, and becauſe of the
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height of their entrance into
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Serchio,
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a thing which is of very
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great import in diſcharging the waters which come ſuddenly, as </
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