Salusbury, Thomas, Mathematical collections and translations (Tome I), 1667

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              ^{*}
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              Lizza-Fuſina,
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              laden with freſh water, for the ſervice of the City.
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              <s>Let us therefore fancy one of thoſe Barks, to come from thence
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              with moderate velocity along the Lake, carrying the water gently,
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              of which it is full: and then either by running a ground, or by
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              ſome other impediment that it ſhall meet with, let it be notably
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              retarded. </s>
              <s>The water therein contained ſhall not, by that means,
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              loſe, as the Bark doth, its pre-conceived
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              impetus,
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              but retaining
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              the ſame, ſhall run forwards towards the prow, where it ſhall
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              riſe notably, falling as much a ſtern. </s>
              <s>But if, on the contrary,
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              the ſaid Bark, in the midſt of its ſmooth courſe, ſhall have a new
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              velocity, with notable augmentation added to it, the water
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              tained before it can habituate it ſelf thereto, continuing in its
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              tardity, ſhall ſtay behinde, namely a ſtern, where of
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              quence it ſhall mount, and abate for the ſame at the prow. </s>
              <s>This
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              effect is undoubted and manifeſt, and may hourly be
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              ted; in which I deſire that for the preſent three particulars may
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              be noted. </s>
              <s>The flrſt is, that to make the water to riſe on one
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              ſide of the veſſel, there is no need of new water, nor that it run
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              thither, forſaking the other ſide. </s>
              <s>The ſecond is, that the water
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              in the middle doth not riſe or fall notably, unleſſe the courſe of
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              the Bark were not before that very ſwift, and the ſhock or other
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              arreſt that held it exceeding ſtrong and ſudden, in which caſe its
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              poſſible, that not only all the water might run forwards, but
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              that the greater part thereof might iſſue forth of the Bark: and
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              the ſame alſo would enſue, whilſt that being under ſail in a
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              ſmooth courſe, a moſt violent
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              impetus
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              ſhould, upon an inſtant,
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              overtake it: But when to its calme motion there is added a
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              derate retardation or incitation, the middle parts (as I ſaid)
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              obſervedly riſe and fall: and the other parts, according as they
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              are neerer to the middle, riſe the leſſe; and the more remote,
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              more. </s>
              <s>The third is, that whereas the parts about the midſt do
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              make little alteration in riſing and falling, in reſpect of the
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              ters of the ſides; on the contrary, they run forwards and
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              wards very much, in compariſon of the extreams. </s>
              <s>Now, my
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              Maſters, that which the Bark doth, in reſpect of the water by it
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              contained, and that which the water contained doth, in
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              ſpect of the Bark its container, is the ſelf-ſame, to an hair, with
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              that which the Mediterranean Veſſel doth, in reſpect of the
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              ters in it contained, and that which the waters contained do, in
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              reſpect of the Mediterranean Veſſel their container. </s>
              <s>It
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              eth now that we demonſtrate how, and in what manner it is true,
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              that the Mediterrane, and all the other Straits; and in a word,
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              all the parts of the Earth do all move, with a motion notably
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              uneven, though no motion that is not regular and uniforme, is
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              thereby aſſigned to all the ſaid Globe taken collectively.</s>
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