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fire_n body_n earth_n water_n 8,614 5 6.6720 4 true
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ID Title Author Corrected Date of Publication (TCP Date of Publication) STC Words Pages
A59618 An essay on the certainty and causes of the earth's motion on its axis, &c. Sheeres, Henry, Sir, d. 1710. 1698 (1698) Wing S3059; ESTC R9477 14,034 31

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it remains That we determine how and which way this Fluid put into Motion may be thought to take its Flight I say then that the Fluid investing that Hemisphere wherein the Sun's Fire chances to be in its Greatest Vigour is directed in its course by Lines drawn or produc'd from the cause that Acts thereon Namely the Sun and this by the same Mechanick Laws by which any body is found to move that is impell'd and driven out of its Place by another Body that has force enough to do it namely by right Angles from the Plane of the cause that Acts Wherefore remarking barely that a Line Conceiv'd to be at any time drawn from the Body of the Sun through the Axis of the Earth any where betwixt the Tropicks will not vary much from East and West this single note may suffice to show that the Course or Tendency of the moving Matter or Fluid must be that way namely by right Angles or thereabouts from the Axis of the Globe or which better Expresses it by Circles parallel a little more or less to the Aequator and not towards the Poles Thus stating the Boundaries and Tendency of the Action or Course by which the Fluid wings it's way that Surrounds this Earth I mean that Portion thereof which we call the Atmosphere I come Lastly to make a short necessary note or two touching the Effects of Rarifaction and Condensation viz. According to common acceptation where I observe that the same Body or Quantity of Matter when it is Rarifi'd becomes bigger or is Extended in all its Dimensions and so comes to require more space wherein to be contain'd than it did before and on the contrary when the same Body comes to be Condens'd or Compress'd it needs Consequently a less Space to contain it by which means any Body so alter'd becomes Lighter or Heavier with Respect to the Fluid or Medium wherein it has its Residence But this Alteration by Extension or Contraction can by no means come to pass but by being the cause of some certain Motion for whatsoever Thing requires a greater Space to contain it than it did the Instant before must needs in the same Moment remove some other thing to obtain such new space and whatsoever Thing becomes on the Sudden lessen'd or contracted must occasion the Motion of something or other at the same time to Replenish the Space it deserted by such contraction or shrinking into narrower bounds Having in some degree clear'd the way and conducted the Reader by those steps and that train of Reflection by which I became Establish'd in my Opinion touching the Certainty and Causes as they seem to me to be of the Earth's Motion on its Axis c. I come now to interpret that Motion as I conceive it to be an Effect of those Causes First Then I take for Granted and hope in due place to give probable Proof thereof that the Sun is the Center of the Earth's Gravity towards which it tends Secondly I have observ'd that the Fluid which Invirons the Earth's Globe by the Concurrence of proper admixtures of Matter furnish'd from thence is dispos'd for Motion and by a Posture of Obedience to proper Causes cannot but be deem'd to be Actually ever in a ready State of Mobillity Thirdly I have noted that Rarifaction and Condensation are causes of Motion and that the same quantity of Matter rarifi'd or condens'd becomes Lighter and Heavier as an Effect of such Causes Fourthly I note that every Action of Fire be it more or less breaks or alters the Aequilibrium of the Neighbouring Fluid which we see verifi'd every Moment by the Fire in our Chimneys which is the cause of that noise and whistling of the Wind through the Crannies and Key-holes of a close shut Room where a good Fire is Kept the Air tending and rushing thitherwards by stronger or weaker impulses ratably to the strength or weakness of the cause Acting thereon Fifthly I am in no great doubt but the Sun is the universal Fountain of Fire by whose Transcendent Masculine Force I conceive all the Seeds or Sparks of that Element existing every where here below is disseminated and propagated through out the World which Planet I conceive Acts in the fame manner on this whole Globe and the Fluid that surrounds it as any part or particle of its Fire is found to do on any Fragment of the same matter We see and know that a very small parcel of his Beams united or contracted by a glass will as certainly burn and therefore as certainly Act in proportion by Rarifaction as any Body of Fire of never so much Greater dimentions can be thought to do Whence we may I think safely conclude from the uniformity We find in the Operations of Nature that the Sun which is an immense Body of Fire whose Magnitude we know to be such as to Imbrace with his Heat and Inlighten with his Beams more than Half the Earth's Globe at once Acts in like manner and Proportion on the universal Mass as a Spark of his Fire shot through a Burning Glass does on a drop of Water or any other visible Fluid which we are sure it will Exhale and cause to disappear in a Moment I say that since we are certain that there can be no very great disparity of Proportion betwixt such drop of Water and the least spark of the Sun's Fire Acting thereon and that of this Globe of the Earth and Fluid compar'd with the Collected force of his Universal Influence on the whole Terrestrial Mass We can hardly withstand the Evidence of this Truth namely that the entire Hemisphere which is at once imbrac'd illumin'd and warm'd by that Planets Virtue cannot chuse but be Affected in the same Degree and be Lyable to all those Motions and Alterations which we behold and know to be the Effect of the like Action on the like Subject in lesser Proportions Sixthly We may determine from a bare Guess by what we see and observe That there is an unspeakable Store or Reserve of combustible and proper Matter contain'd on the Surface and in the Bowels of the Earth prepar'd to obey the Sun's Action and Impression thereon and we shall not I hope be Thought to Resolve too boldly if we conclude that as far as that Planets Force penetrates and warms so far he may be Computed to act by Exhalation or Rarifaction call it what you please on the Universal Mass of matter So that by this Mighty force employ'd on a Sufficient Proportion of Subject matter we may be taught to Expect proportionable Effects Wherefore I believe it will be hard to gainsay but that the enlighten'd Hemisphere or that Face of the Globe which is at any time the Scene of this Action must unquestionably Suffer a manifest dimunition of Matter and consequently of weight by the Transpiration Extension and Motion of the Volatile parts which ever Wing their way from the Light to the Dark side of the Globe where by