. Guilielmi Gilberti Colcestrensis, medici londinensis, De magnete : magneticisque corporibus, et de magno magnete tellure; physiologia noua, plurimis & argumentis, & experimentis demonstrata . anum horizontis componitur in inftrumentode-clinationis, fi prius probelibratum fuerit. Hoc autem ideoflt quiimagneticumcum paribus fit interuallis ab vtroque polo,conuerti~bili fua natura verfus neutrum declinat, fed aequaliter ad libellamhorizontis directum manetjvel uti cum fuper acum,aut fuper aquamIiberum & folutum iacet. Cum veroin latitudine aliqua ab 9qua-tore magneticum fuerit; autcum attollitu
. Guilielmi Gilberti Colcestrensis, medici londinensis, De magnete : magneticisque corporibus, et de magno magnete tellure; physiologia noua, plurimis & argumentis, & experimentis demonstrata . anum horizontis componitur in inftrumentode-clinationis, fi prius probelibratum fuerit. Hoc autem ideoflt quiimagneticumcum paribus fit interuallis ab vtroque polo,conuerti~bili fua natura verfus neutrum declinat, fed aequaliter ad libellamhorizontis directum manetjvel uti cum fuper acum,aut fuper aquamIiberum & folutum iacet. Cum veroin latitudine aliqua ab 9qua-tore magneticum fuerit; autcum attollitur telluris polus alter(nondico attollitur fgpra horizontem vifibilem, vt in coelo voluentismundi vulgo exiftimatus polus, fed fuprafinitorem centri,fiue pro-priam dimetientem, plano horizontis vifibilis aequidiftantem, quce vera 138 ... GVILIEL. GILBERTI vera eft clcuatlo poli terreftris) tunc declinatio apparet, & inclinatfcrrum vcrfus corpus tclluris in meridiano fuo. Veluti ABhorizonrcgionis vifibilis$C D horizon terrae, ipfam in sequalia diuidens $ EF axis terrae 5 G locus rcgionis: Manifeftum, qu6d polus borcalis E,cleuatur fupra pun<3uin C,quantum ab aequatorc:. quarecum in E magneticum fcrrum pcrpcndicularrter crigitur iuiUconucrfionc (vt antea fsepe docuimus) id nunc in G cft conuerfioquxdam incepta pro Iatitudinis ratione (& plano horizontis decli-nantc magnetico ) & magneticum ad angulos inasquales interfecathorizontem, & fub horizontc dcclinationem indicat: Ob eamquccaufam fiferrum declinatorium pofitum fuerit in G, cius meridio-nalis finis qui videlicetin Bprcam dircctus cft ,defccndit infrapla-num horizontis vifibilis AB. Itaquemaxima cft difFcrentia inter rc-ctam, & polarcm fiuc parallclam fphaeram, vbi polus eft in ipfo Ze-nith. Nam in recti fyhxA ferrum plano horizontis parallelum autem pdlus coeleftis in verticali puncto fuerit, vel cum tel-luris polus fit ipfe locus rcgionis, tunc ferrum cft horizonti perpen-diculare. Dcmonftratur hoc lapid
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