Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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the River
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Arno
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raiſed by a Land-flood half a Brace, I might con
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fidently affirm the ſaid River to be raiſed in
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Piſa
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thoſe ſix or ſe
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ven Braces, &c. </
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>From ſuch like accidents I conclude in the ſame
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Letter, that it is neceſſary to make great account of every little
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riſe that
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Fiume morto
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ſhall make towards the Sea. </
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<
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>Now cometh
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Bartolotti
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(and perhaps becauſe I knew not how to expreſs my
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ſelf better, underſtandeth not my Propoſition) and ſpeaketh that
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which indeed is true, but yet beſides our caſe: Nor have I ever
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ſaid the contrary; and withall doth not apply it to his purpoſe.
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<
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>Nay I ſay, that if he had well applyed it, this alone had been a
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ble to have made him change his opinion. </
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>And becauſe he ſaith,
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that I ſaid, that it is true, when the abatement proceedeth from
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ſome cauſe above, as namely by Rain, or opening of Lakes;
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But when the cauſe is from below, that is, by ſome ſtop, as for
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inſtance ſome Fiſhers Wears or Locks, or ſome impediment re
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mote from the Sea, although at the Level it ſhall riſe ſome Braces
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where the impediment is, yet that riſing ſhall go upwards; and
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here he finiſheth his Diſcourſe, and concludeth not any thing
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more. </
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>To which I ſay firſt, that I have alſo ſaid the ſame in the
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Propoſition, namely, that a Flood coming (which maketh
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Arno
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to riſe in
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Piſa
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ſix or ſeven Braces (which I take to be a ſuperiour
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cauſe whether it be Rain or the opening of Lakes, as beſt plea
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ſeth
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Bartolotti
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) in ſuch a caſe I ſay, and in no other (for towards
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the Sea-coaſts it ſhall not cauſe a riſing of full half a Brace; and
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therefore ſeeing
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Arno
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at the Sea-ſide to be raiſed by a Flood, whe
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ther of Rain, or of opening of Lakes half a Brace) it may be
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inferred, that at
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Piſa
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it ſhall be raiſed thoſe ſix or ſeven Braces;
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which variety, well conſidered, explaineth all this affair in favour
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of my opinion: For the riſing that is made by the impediment
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placed below, of Fiſhing Weares and Locks, operateth at the be
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ginning, raiſing the Waters that are neer to the impediment;
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and afterwards leſs and leſs, as we retire upwards from the im
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pediment: provided yet that we ſpeak not of a Flood that com
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meth by acceſſion, but onely of the ordinary Water impeded.
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<
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>But there being a new acceſſion, as in our caſe, then the Water
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of the Flood, I ſay, ſhall make a greater riſing in the parts ſuperi
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our, far from the impediment; and theſe impediments ſhall
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come to be thoſe that ſhall overflow the Plains, as happened
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eighteen or nineteen years ago, before the opening of
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Fiume
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morto
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into the Sea, The ſame will certainly follow, if
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Fiume
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morto
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be let into
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Serchio.
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Here I could alledge a very pretty
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caſe that befell me in
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la ^{*} Campagna di Roma,
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neer to the Sea
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ſide. </
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<
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>where I drained a Bog or Fen, of the nature of the Wa
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ters of
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Piſa,
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and I ſucceeded in the enterprize, the Waters in their
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ſite towards the Sea abating only three Palmes, and yet in the </
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