Galilei, Galileo
,
The systems of the world
,
1661
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calm and tranquill. </
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<
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>And if I had continually held that pen in
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my hand, and had onely moved it ſometimes an inch or two this
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way or that way, what alteration ſhould I have made in that its
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principal, and very long tract or ſtroke?</
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>SIMP. </
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>Leſs than that which the declining in ſeveral places from
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abſolute rectitude, but the quantity of a flea's eye makes in a right
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line of a thouſand yards long.</
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>SAGR. </
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>If a Painter, then, at our launching from the Port, had
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began to deſign upon a paper with that pen, and continued his
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work till he came to
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Scanderon,
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he would have been able to have
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taken by its motion a perfect draught of all thoſe figures perfectly
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interwoven and ſhadowed on ſeveral ſides with countreys,
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ings, living creatures, and other things; albeit all the true, real,
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and eſſential motion traced out by the neb of that pen, would
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have been no other than a very long, but ſimple line: and as to
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the proper operation of the Painter, he would have delineated the
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ſame to an hair, if the ſhip had ſtood ſtill. </
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>That therefore of the
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huge long motion of the pen there doth remain no other marks,
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than thoſe tracks drawn upon the paper, the reaſon thereof is
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cauſe the grand motion from
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Venice
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to
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Scanderon,
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was common to
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the paper, the pen, and all that which was in the ſhip: but the petty
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motions forwards and backwards, to the right, to the left,
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municated by the fingers of the Painter unto the pen, and not to
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the paper, as being peculiar thereunto, might leave marks of it ſelf
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upon the paper, which did not move with that motion. </
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<
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>Thus it
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is likewiſe true, that the Earth moving, the motion of the ſtone in
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deſcending downwards, was really a long tract of many hundreds
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and thouſands of yards, and if it could have been able to have
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lineated in a calm air, or other ſuperficies, the track of its courſe,
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it would have left behind an huge long tranſverſe line. </
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>But that
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part of all this motion which is common to the ſtone, the Tower,
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and our ſelves, is imperceptible to us, and as if it had never been,
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and that part onely remaineth obſervable, of which neither the
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Tower nor we are partakers, which is in fine, that wherewith the
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ſtone falling meaſureth the Tower.</
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<
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>SALV. </
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<
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>A moſt witty conceipt to clear up this point, which was
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not a little difficult to many capacities. </
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<
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>Now if
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Simplicius
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will
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make no farther reply, we may paſs to the other experiments, the
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unfolding of which will receive no ſmall facility from the things
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already declared.</
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<
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>SIMP. </
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<
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>I have nothing more to ſay: and I was well-nigh
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ported with that delineation, and with thinking how thoſe ſtrokes
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drawn ſo many ways, hither, thither, upwards, downwards,
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wards, backwards, and interwoven with thouſands of turnings, are
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not eſſentially or really other, than ſmall pieces of one ſole line </
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