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earth_n north_n pole_n south_n 3,753 5 10.5697 5 false
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ID Title Author Corrected Date of Publication (TCP Date of Publication) STC Words Pages
A45885 A discourse concerning repentance by N. Ingelo ... Ingelo, Nathaniel, 1621?-1683. 1677 (1677) Wing I182; ESTC R9087 129,791 455

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Metal to it That without any sensible alteration in the Agent or the Patient the Loadstone will in a trice communicate all its virtues to a piece of Steel and enable that to communicate them to another piece of the same Metal That if a Loadstone having been markt at one end be cut long-wise according to its Axis and one Segment be freely suspended over the other the halves of the markt end that touch'd one another before will not now lie together but the lower will drive away the upper and that which regarded the North in the markt end of the intire Loadstone will join with that extreme of the lower half which in the intire stone regarded the South That as appears by this last nam'd Property there are the same Magnetical Qualities in the separated parts of a Magnet as in the intire stone and if it be cut or even rudely broken into a great many parts or fragments every one of these portions though perhaps not so big as a Corn of Wheat will if I may so speak set up for its self and have its own Northern and Southern Poles and become a little Magnet sui juris or independent upon the stone from which 't was sever'd and from all its other parts That if a Loadstone be skilfully made Spherical this little Magnetick Globe very fitly by our Gilbert call'd a Terrella will not only being freely plac'd turn North and South and retain that Position but have its Poles its Meridians its AEquator c. upon good grounds designable upon it as they are upon the great Globe of the Earth And this will hold whether the Terrella be great or small I might not only much encrease the number of these odd Magnetical Phaenomena's but add others about other Subjects But these may suffice to suggest to us this Reflection That there is no doubt to be made but that a Man who never had the opportunity to see or hear of Magnetical Experiments would look upon these as contrary to the Principles of Nature and therefore to the Dictates of Reason as accordingly some Learned Aristotelians to whom I had occasion to propose some of them rejected them as Incredible And I doubt not but I could frame as plausible Arguments from the meer Axioms of Philosophers and the Doctrine of Philosophick Schools against some Magnetical Phaenomena which Experience hath satisfi'd me of as are wont to be drawn from the same Topicks against the Mysterious Articles of Faith since among the strange Properties of the Loadstone there are some which are not only admirable and stupendious but seem repugnant to the Dictates of the received Philosophy and the course of Nature For whereas Natural Bodies how subtile soever require some particular Dispositions in the Medium through which their Corpuscles are to be diffus'd or their Actions transmitted so that Light it self whether it be a most subtile Body or a naked Quality is resisted by all opacous Mediums and the very effluvia of Amber and other Electricks will not permeate the thinnest Glass or even a sheet of fine Paper yet the Loadstone readily performing his Operations through all kind of Mediums without excepting Glass it self If the Poles of two Magnetick Needles do both of them regard the North another Philosopher would conclude them to have a Sympathy at least to be unlikely to disagree and yet if he bring these Extremes of the same Denomination within the reach of one another one will presently drive away the other as if there were a powerful Antipathy between them A somewhat long Needle being plac'd horizontally and exactly poiz'd upon the point of a Pin if you gently touch one end with the Pole of a vigorous Magnet that end shall manifestly dip or stoop though you often take it off the Pin and put it on again And this inclination of the Needle will continue many years and yet there is not only no other sensible change made in the Metal by the Contact of the Loadstone but one end has requir'd a durable Preponderancy though the other be not lighter nor the whole Needle heavier than before And the Inclination of the Magnetick Needle may be by another touch of the Loadstone taken away without lessning the weight of the part that is depriv'd of it The Operation that in a trice the Loadstone has on a Mariners Needle though it makes no sensible change in it or weakens the Loadstone it self will not be lost though you carry it as far as the Southern Hemisphere but it will not be the same in all places but in some the Magnetick Needle will point directly at the North in others 't will deviate or decline some degrees towards the East or the West And which seems yet more strange the same Needle in the same place will not always regard the same point of the Compass but lookt on at distant times may vary from the true Meridian sometimes to the West and afterwards to the East All the communicable virtues of the Magnet may be imparted to Iron without any actual Contact of the two Bodies but barely by approaching in a convenient way the Iron to the Loadstone for a few moments And the Metal may likewise be depriv'd of those virtues in a trice without any immediate Contact by the same or another Loadstone If you mark one end of a Rod or other oblong piece of Iron that never came near a Magnet and hold it perpendicularly you may at pleasure and in the hundreth part of a minute make it become the North or South Pole of a Magnetical Body For it when 't is held upright you apply to the bottom of it the North-extreme of an excited and well-poiz'd Needle the lower end of the Iron will drive away that Extreme which yet will be drawn by the upper end of the same Iron And if by inverting you make this lower end the uppermost it will not attract but repel the same Lilly or North-point of the Needle just under which it is to be perpendicularly held Though vis unita fortior be a receiv'd Rule among Naturalists yet oftentimes if a Magnet be cut into pieces these will take up and sustain much more Iron than the intire stone was able to do If of two good Loadstones the former be much bigger and on that account stronger than the other the greater will draw a piece of Iron and retain it much more strongly than the lesser and yet when the Iron sticks fast to the greater and stronger Loadstone the lesser and weaker may draw the Iron from it and take it quite away These Phaenomena to mention now no more are so repugnant to the common sentiments of Naturalists and the ordinary course of things that if antecedently to any Testimony of experience these Magnetical Properties had been propos'd to Aristotle himself he would probably have judg'd them fictitious things as repugnant to the Laws of Nature Nevertheless though it seems incredible that the bare touch of a Loadstone should