Salusbury, Thomas
,
Mathematical collections and translations (Tome I)
,
1667
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331 - 331
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ſheweth his diſtruſt of a Spherical Inſtrument compoſed by
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chimedes
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hiſmelf to take the Suns ingreſſion into the
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If in the fixed
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ſtars one ſhould
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diſcover any
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nual mutation, the
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motion of the
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Earth would be
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undeniable.
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It is proved what
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ſmall credit is to be
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given to
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mical Inſtruments
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in minute
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tions.
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* Braceia Italian.</
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* Or Mill.</
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Ptolomy
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did not
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truſt to an
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ment made by
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chimedes.</
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Inſtruments of
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Tycho
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made with
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great expence.
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>SIMP. </
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>But if the Inſtruments be ſo ſuſpitious, and the
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vations ſo dubious, how can we ever come to any certainty of
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things, or free our ſelves from miſtakes? </
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>I have heard ſtrange
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things of the Inſtruments of
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Tycho
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made with extraordinary coſt,
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and of his ſingular diligence in obſervations.</
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<
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>SALV. </
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>All this I grant you; but neither one nor other of
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theſe is ſufficient to aſcertain us in a buſineſſe of this importance. </
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I deſire that we may make uſe of Inſtruments greater by far, and
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by far certainer than thoſe of
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Tycho,
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made with a very ſmall
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charge; the ſides of which are of 4. 6. 20. 30. and 50. miles, ſo
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as that a degree is a mile broad, a minute prim. </
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>50 ^{*} yards, a
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ſecond but little leſſe than a yard, and in ſhort we may without
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a farthing expence procure them of what bigneſſe we pleaſe. </
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<
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being in a Countrey Seat of mine near to
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Florence,
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did plainly
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obſerve the Suns arrival at, and departure from the Summer
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Solſtice, whilſt one Evening at the time of its going down it
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peared upon the top of a Rock on the Mountains of
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Pictrapana,
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about 60. miles from thence, leaving diſcovered of it a ſmall
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ſtreak or filament towards the North, whoſe breadth was not
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the hundredth part of its Diameter; and the following Evening
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at the like ſetting, it ſhew'd ſuch another part of it, but notably
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more ſmall, a neceſſary argument, that it had begun to recede
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from the Tropick; and the regreſſion of the Sun from the firſt to
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the ſecond obſervation, doth not import doubtleſſe a ſecond
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nute in the Eaſt. </
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>The obſervation made afterwards with an
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quiſite Teleſcope, and that multiplyeth the
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Diſcus
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of the Sun
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more than a thouſand times, would prove eaſie, and with all
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delightful. </
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>Now with ſuch an Inſtrument as this, I would have
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obſervations to be made in the fixed ſtars, making uſe of ſome
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of thoſe wherein the mutation ought to appear more
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ous, ſuch as are (as hath already been declared) the more
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mote from the Ecliptick, amongſt which the Harp a very great
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ſtar, and near to the Pole of the Ecliptick, would be very
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per in Countries far North, proceeding according to the
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ner that I ſhall ſhew by and by, but in the uſe of another ſtar;
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and I have already fancied to my ſelf a place very well adapted
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for ſuch an obſervation. </
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>The place is an open Plane, upon
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which towards the North there riſeth a very eminent Mountain,
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in the apex or top whereof is built a little Chappel, ſituate Eaſt
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and Weſt, ſo as that the ridg of its Roof may interſect at right
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angles, the meridian of ſome building ſtanding in the Plane. </
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<
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will place a beam parallel to the ſaid ridg, or top of the Roof, </
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