Castelli, Benedetto, Of the mensuration of running waters, 1661
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              <s>All which Operations might be brought to perfection with
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              150. thouſand Crowns, well and faithfully laid out; which ſumm
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              the
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              Bologneſi
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              will not be unwilling to provide; beſides that thoſe
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                <emph type="italics"/>
              Ferrareſi
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              ought to contribute to it, who ſhall partake of the
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              benefit.</s>
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              <s>Let me be permitted in this place to propoſe a thing which I
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              have thought of, and which peradventure might occaſion two
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              benefits at once, although it be not wholly new. </s>
              <s>It was in the
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              time of
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              Pope Paul
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              V. propounded by one
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              Creſcenzio
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              an Ingi­
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              neer, to cut the
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              Main-Po,
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              above
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              le Papozze
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              ; and having made a
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              ſufficient evacuation to derive the water thereof into the P
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              o
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              of
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                <emph type="italics"/>
              Adriano,
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              and ſo to procure it to be Navigable, which was not at
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              that time effected, either by reaſon of the oppoſitions of thoſe,
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              whoſe poſſeſſions were to be cut thorow, or by reaſon of the
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              great ſum of money that was neceſſary for the effecting of it: But
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              in viewing thoſe Rivers, we have obſerved, that the ſedge cutting
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              might eaſily be made below
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              le Papozze,
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              in digging thorow the
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              Bank called
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              Santa Maria,
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              & drawing a Trench of the bigneſs that
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              skilful Artiſts ſhall judge meet unto the P
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              o
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              ^{*} of
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              Ariano,
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              below the
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                <lb/>
                <emph type="italics"/>
              Secche
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              of the ſaid S.
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              Maria
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              ; which as being a work of not
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              above 160. Perches in length, would be finiſhed with onely
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              12000. Crowns.</s>
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              <s>
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              * Of
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              Adriano.
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              </s>
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              <s>Firſt; it is to be believed, that the waters running that way,
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              would not fail to open that Mouth into the Sea, which at pre­
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              ſent is almoſt choakt up by the Shelf of Sand, which the new
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              Mouth of
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              Ponto Virro
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              hath brought thither; and that it would
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              again bring into uſe the Port
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              Goro,
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              and its Navigation.</s>
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              <s>And haply experience might teach us, that the ſuperficies of
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              P
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              o
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              might come to fall by this aſſwagement of Water, ſo that the
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              acceſſion of
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              Reno
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              would queſtionleſs make no riſing in it:
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              Whereupon, if it ſhould ſo fall out, thoſe Princes would have
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              no reaſon to complain; who ſeem to queſtion, leſt by this new
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              acceſſion of water into P
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              o,
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              the Sluices might be endangered.
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              </s>
              <s>Which I thought not fit to omit to repreſent to your Lordſhip;
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              not, that I propoſe it to you as a thing abſolutely certain, but that
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              you might, if you ſo pleaſed, lay it before perſons whoſe judge­
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              ments are approved in theſe affairs.</s>
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              <s>I return now from where I degreſt, and affirm it as indubita­
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              ble, that
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              Reno
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              neither can, nor ought to continue longer where
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              it at this day is; and that it cannot go into any other place but
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              that, whither
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              Cardinal Capponi
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              deſigned to carry it, and which
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              at preſent pleaſeth me better than any other; or into
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              Volana,
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              whence it was taken away; the vigilance of Men being able to
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              obviate part of thoſe miſchiefs, which it may do there.</s>
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              <s>But from its Removal, beſides the alleviation of the harm </s>
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