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

Table of figures

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              <s>
                <pb xlink:href="040/01/175.jpg" pagenum="157"/>
              ball ſuſpend it ſelf in its range directly over the Piece. </s>
              <s>And in a
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              word, if you do but attentively conſider, you will comprehend,
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              that the motion of the Earth in transferring the Piece along with
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              it from C A to E D, conferreth upon the tranſverſe line C D, ſo
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              much of little or great inclination, as is required to adjuſt the
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              range to its perpendicularity. </s>
              <s>But you err, ſecondly, in that you
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              referr the faculty of carrying the ball along with the Earth to the
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              impulſe of the fire, and you run into the ſame error, into which
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                <emph type="italics"/>
              Salviatus,
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              but even now ſeemed to have fallen; for the faculty
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              of following the motion of the Earth, is the primary and perpetual
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              motion, indelibly and inſeparably imparted to the ſaid ball, as to a
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              thing terreſtrial, and that of its own nature doth and ever ſhall
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              poſſeſs the ſame.</s>
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            <p type="main">
              <s>SALV. </s>
              <s>Let us yield,
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              Simplicius,
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              for the buſineſs is juſt as he
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                <arrow.to.target n="marg347"/>
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              ſaith. </s>
              <s>And now from this diſcourſe let us come to underſtand the
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              reaſon of a Venatorian Problem, of thoſe Fowlers who with their
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              guns ſhoot a bird flying; and becauſe I did imagine, that in regard
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              the bird flieth a great pace, therefore they ſhould aim their ſhot far
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              from the bird, anticipating its flight for a certain ſpace, and more
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              or leſs according to its velocity and the diſtance of the bird, that
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              ſo the bullet haſting directly to the mark aimed at, it might come
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              to arrive at the ſelf ſame time in the ſame point with its motion,
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              and the bird with its flight, and by that means one to encounter
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              the other: and asking one of them, if their practiſe was not ſo
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              to do; He told me, no; but that the ſlight was very eaſie and
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              certain, and that they took aim juſt in the ſame manner as if they
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              had ſhot at a bird that did ſit ſtill; that is, they made the flying
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              bird their mark, and by moving their fowling-piece they followed
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              her, keeping their aim ſtill full upon her, till ſuch time as they let
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              fly, and in this manner ſhot her as they did others ſitting ſtill. </s>
              <s>It is
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              neceſſary therefore that that motion, though ſlow, which the
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              ing-piece maketh in turning and following after the flight of the
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              bird do communicate it ſelf to the bullet alſo, and that it be joyned
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              with that of the fire; ſo that the ball hath from the fire the
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              tion directly upwards, and from the concave Cylinder of the barrel
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              the declination according to the flight of the Bird, juſt as was ſaid
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              before of the ſhot of a Canon; where the ball receiveth from the
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              fire a virtue of mounting upwards towards the Zenith, and from
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              the motion of the Earth its winding towards the Eaſt, and of both
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              maketh a compound motion that followeth the courſe of the
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              Earth, and that to the beholder ſeemeth onely to go directly
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              wards, and return again downwards by the ſame line. </s>
              <s>The
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              ing therefore of the gun continually directed towards the mark,
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              maketh the ſhoot hit right, and that you may keep your gun
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              rected to the mark, in caſe the mark ſtands ſtill, you muſt alſo hold </s>
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