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A04327 Magneticall aduertisements: or Diuers pertinent obseruations, and approued experiments, concerning the natures and properties of the load-stone Very pleasant for knowledge, and most needfull for practise, of trauelling, or framing of instruments fit for trauellers both by sea and land. Whereunto is anexed a breife discouerie of the idle animaduersions of Mark Ridley Dr. in Physicke, vpon a treatise entituled Magneticall aduertisements. Barlow, William, d. 1625.; Barlow, William, d. 1625. Breife discovery of the idle animadversions of Marke Ridley. aut; Gilbert, William, 1540-1603. De magnete. 1618 (1618) STC 1444; ESTC S100862 50,744 107

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labour to cleare some thinke c. in his booke meaning mee being not contented onely to vsurpe that which was properly mine for his owne as aforesaid but also hee tooke vpon him although very ignorantly to confute some of mine vnder these termes and this onely out of a stolne Manuscript Whereas all men know that Manu-scripts ought to be vncontrould vntill the Author hath published them who may alter and change things in the meane space as he thinketh good He stileth himselfe principall Phisition vnto the Emperor of Russia the which many men wonder at being so yong as he than was and supposed that he went ouer only as Phisition vnto our Merchants there that he should in so short a time become that Emperors principall Phisition If he were he sped better then Bomelius did who is said to haue died there in that cold climat of the extreamest hot kinde of Calenture Out of all question somewhat it is more then ordinarie that maketh him of so hauty a spirit so to braue the world with such prodigious assertions of his Magneticals in and aboue the Moone the earths Magneticall circular Motions and his paltry abusing of the holy scriptures to support his lunaticke fictions vnder the name of Magneticall Philosophie There are yet two texts of Scripture which it is a wonder how they escaped him the one is in Iosuah 10. ver 12. and the other is in Esay 38. ver 8. In the one That the Sunne and the Moone stood still the space of a whole day The other that the shadow in Achas diall went backe 10 degrees and the Sunne in the skie returned 10 degrees by the which he was descended For it is his guise to make contrary conclusions vnto that which the Scriptures affirme and therefore blame him not if he doe so despise Aristotle who neuer taught any such Logicke Now therefore that yee may in few words vnderstand the vntruth of the earths Magneticall Motion that is so mainely emblazoned by him and the weaknes of my Animaduersors Magneticall skill you must know that the Magneticall Motion is a naturall inclination of two Magnets or Magneticall bodies that may freely moue respecting the one the other within the Orbe of their forces with their convenient ends that is to say the North end of the one alwaies respecting the South of the other If the two Magnets or Magneticall bodies be of like quantitie forme and goodnes their Motions will be of like quicknes of the one towards the other but if they differ in any of these their Motions will be so much the slower Now forasmuch as all Magneticall motions are alwaies respectiue of the one Magnet or Magneticall bodie towards another it followeth by necessarie consequent that no Magnet or Magneticall body can either moue or be moued of it selfe but is vtterly voide of all intrinsecall or selfe-selfe-Motion the true and onely cause of his Motion being euermore without it selfe And therfore mine Animaduersors selfe-motion of the Globe of the earth circularly by Magneticall vigour in the which hee doth so gallantly triumph is but an idle figment and a meere Chimaera but his definition of Magneticall bodies is very sutable vnto it viz. very monstrous namely That wee define to be a Magneticall body which doth remaine and place it selfe in one place or kinde of situation naturall not alterable as all starres doe and the great Regent globes of Saturne Mars Iupiter the Sunne and the Earth doe or such as with respect and attendance follow other globes as the two starres which support Saturne the foure attendants vpon Iupiter lately discouered by the truncke-spectacle the two trauersers about the Sunne called Venus and Mercury and the Moone which doth follow or goe about the earth and respecteth the same alwayes with one Pole and therefore hath a peculiar Magneticall vertue that guideth her in this kinde of situation Auditum admissi risum teneatis amici Any man that considereth this goodly definition being the foundation and ground of his Magneticall discourse and the very first sentence of his booke and many the like fancies in his Motions and and Animaduesions will easily discerne what his Magneticall skill is and what a vanity it were for me to spend any precious time to confute in particular such vnreasonable and senselesse opinions which haue more neede of Helleborus to purge them out of his head then Arguments to confute them in his booke And in his friuolous animaduersions seeking to maintaine his former errours and he being so snappish to haue them amended hee maketh them ten times worse then they were before and far more palpable But my tetricall Animaduersor must be ruled by reason and affoord all those his patience that do beleeue the holy Scriptures which flatly doe denie the Earths motion and affirme the motion of the Sunne Moone Stars in the whole current thereof as Psal. 19. 6. 104. 5. Iosua 10. 12. 13. 14. Esay 38. 8. c. Also that hee will giue men leaue to credit their senses in matters subiect vnto sense and not repugnant vnto reason and that he will not be offended with those who do pitifully laugh at his Magneticall Astronomy with those topsituruy motions like Voluitur lxion se sequiturque fugitque For although some great learned men in those Sciences haue vsed the supposed motion of the earth for an Hypothesis seruing their ready calculations as they haue done also their supposed Epicycles for the motions of the Planets and their courses yet that is no reason for to auouch them for to be in themselues true and reall things according vnto some mens vaine fancies who doe argue after this sort It is an easier matter and more as they say agreeable vnto nature for so small a body as the globe of the Earth is in comparison of the heauens to mooue circularly in the space of foure and twenty houres then it is for the huge Vniuerse so to doe and that which is done with lesse hazard is to bee preferred before the like which may not bee performed without feare of a greater danger with diuers other reasons like vnto these But although such as these are may goe current in a mechanicall Trades-man shop yet they are very insufficient to bee allowed for good by men of learning and Christians by profession who know right well that it is great folly for to oppose that which we call difficult vnto an omnipotent power Who stretcheth out the heauens like a curtaine and spreadeth them out as a tent to dwell in Esay 40. ve 22. He stretcheth out the North ouer the empty and hangeth the earth vpon nothing c. Iob 26. ver 7. And that which we call Nature it being nothing else but Gods ordinance there can bee nothing contrary but all things agreeable vnto nature which God hath ordained But God hath ordained the motion of the Sunne Moone and Stars as aforesayd and the vnmooueablenesse of the earth therfore this is more easie and more
before I read his learned workes and had tried many of his experiments with mine owne hands and had conferred with great Trauellers and pervsed the obseruations of our chiefest Nauigators both for their variations and declinations I neuer beleeued it my selfe But this I may truely affirme that searching with diligence his first fiue bookes and making triall of all those propositions which I iudged to be of importance I alwaies found the maine drift touching this point certaine constant and agreeable to the diligent obsernations of diuers men of experience although in some other matters of the Loadstone his experiments and mine did sometimes disagree as I signified to himselfe in his life time which he did take in very good part as I haue yet his owne letters to shew But concerning his sixth Booke entreating of the motion of the earth I thinke there is no man liuing farther from beleeuing it than my selfe being nothing at all perswaded there vnto by the reasons of other men which he alledgeth and as little or lesse if it were possible by those his inventions endeuouring to proue the motion of the earth by the earthes Magneticall force and vertue Amicus Socrates Amicus Plato sed magis amica veritas is the onely cause why I doe embrace his iudgment in the one and refuse it in the other in matters of this nature following this Rule Nullius addictus iurare in verba Magistri But to returne to the Magnetisme of the whole earth I doe hold it to be one of the rarest and excellent est inventions and the best followed by him with euident proofes and of the greatest consequence for the admirable art of Nauigation that euer was found out since the Creation of the world so that it may well be said of him touching that point Exegit monumentum aere perennius Regalique situ pyramidū altius in respect of the manifold vse and commoditie thereof in the doings of this life The properties of the Magnet seruing not onely for Sea-affaires but also for trauelling by Land in vaste and solitarie deserts for moueable Sun-dyalls in all places of the world for the more ready and exact Chorographie of any Countrey or the true plotting of any ground and for the following of any Minerall veyne that is voide of Iron vnder the earth for Pioners and diggers in Mines And in all this appeareth the wonderfull power and goodnes of God who hath vouchsafed to reueale vnto the weake knowledge of man now towards the end of the world his admirable treasure before vnknowne of his powerfull Creation by effect so plaine vnto the mean est capacitie And that out of a base contemptible and dead creature as it seemeth to be and yet filled with such excellent and wonderfull vertue that all the Gemms of the world haue not the like neither if it were wanting could supply the want thereof or counter vaile the benefit that it bringeth to the life of man Claudianus a famous Poet well nere twelue hundred yeares since saith as much in commendation of the Magnete when as yet the Serediticall or Iron-drawing property thereof was onely knowne Lapis est cognomine Magnes Decolor obscurus vilis c. And againe Sed noua si nigri videas miracula saxi Tunc superat pulchros cultus quicquid Eoïs Indus littoribus rubra scrutatur in algâ But what would he not haue said had hee seene the true closset indeed of all Magneticall miracles vnlocked and in glorious manner set wide open as now it is at this day Many of our Nation both Gentlemen and others of excellent witts and louers of these knowledges not able to read Doctor Gilberts Booke in Latin haue bin euer since the first publishing thereof exceeding desirous to haue it translated into English but hitherto no man hath done it neither to my knowledge as yet goeth about any such matter whereof one principall cause is that there are very few that vnderstand his Booke because they haue not Loadstones of diuers formes but especially round ones Also such versory needles fitly framed and artificially placed vpon their pins and other such implements as he doth there prescribe wherewith being furnished as they read his propositions in words they might still see the truth of them in the things themselues according as himselfe forewarneth that these skills must be learned Ex rebus ipsis non solum ex libris out of the things themselues and not onely out of Bookes A second cause may be for that there are diuers words of Art in the whole course of this booke proper to this subiect and fit to the explanation of his figures and diagrammes which cannot be vnderstood but by the helpe of the Mathematicks and good trauelling in the Magneticall practise Moreouer his alleadging of other mens erroneous opinions concerning this Argument and his confutations thereof may seeme at the first to a yong beginner somewhat harsh and tedious Both which I suppose in the English translation if any were might well be omitted like as in this my Treatise I thinke it not altogether so pertinent to handle them all And a sport it is to behold diuers of smart witts and such as weene themselues to be so great Clerkes that they will aduenture boldly to dispute de omni scibili how miserably they runne their witts on ground when onely by a slender reading ouer of his booke or most commonly some part thereof they will take vpon them to define controule and discourse of those matters fearing nothing more than that of the Poet mihi turpe relinqui est Et quod non didici sane nescire fateri For being vrged by diuers of our Gentlemen among whom these knowledges are had now a daies in some request somewhat they must speake which must be either superciliously to scorne such things as vanities because themselues vnderstand them not or else with slender ostentation to blunder out their masked ignorance supposing it to be inough for them to say that they haue read Dr. Gilberts Booke and so to vse that for a Supersedeas to acquite them of any farther inquirie But many being now at length weary to take such counterfeit shewes for good payment doe seriously seeke to haue some sound knowledge of the things themselues and not to depend vpon other mens extravagant disputes but to be their owne iudges in matters that concerne themselues and are subiect to their owne senses and reasons and especially because some of them must aduenture their whole estates yea and also their liues vpon the right vnderstanding of some Magneticall conclusions Wherefore vpon the earnest longing of certaine mine Honorable and Worshipfull freinds and for the singular loue that I beare to the louers and practizers of the worthy Art of Nauigation and to satisfie the commendable desires of such as like to haue some insight though themselues be not praectizers in these matters of admirable knowledge and great vtilitie I haue vndertaken to contriue all the