. Guilielmi Gilberti Colcestrensis, medici londinensis, De magnete : magneticisque corporibus, et de magno magnete tellure; physiologia noua, plurimis & argumentis, & experimentis demonstrata . diani remoueturj ferrum magneticum ( quod ver-fus polum tendit^nonampliusmanetindQclinationisiua^gradujfedver^LIScentrummagisinclinat.• IJire&oria enim vis firmior eft de- clinatoriS j Et declinandi omnis rjoteftas tollitur,fiinparallelo fue*rit inftrumenti planum. Tum namque magneticum ferrum, quiapropteraxem tranfuerfd pofitum locum fibi debitum obtinere nonpoteft,perpendiculariterterram defpe&at; atq
. Guilielmi Gilberti Colcestrensis, medici londinensis, De magnete : magneticisque corporibus, et de magno magnete tellure; physiologia noua, plurimis & argumentis, & experimentis demonstrata . diani remoueturj ferrum magneticum ( quod ver-fus polum tendit^nonampliusmanetindQclinationisiua^gradujfedver^LIScentrummagisinclinat.• IJire&oria enim vis firmior eft de- clinatoriS j Et declinandi omnis rjoteftas tollitur,fiinparallelo fue*rit inftrumenti planum. Tum namque magneticum ferrum, quiapropteraxem tranfuerfd pofitum locum fibi debitum obtinere nonpoteft,perpendiculariterterram defpe&at; atquemodo in fuo ma-net meridianp, fiue in illo qui vulgo magneticus dicitur. CAP. IX. Demonftratio directionis, aut variationisavera direBione7fimulcum declinatione \ lonico tantumin aqua motu, a difponente virtuteZ$ comertibiti. Uum ferreum tenue trium digitorum tranfeat perfuberis corticem rotundum, ita vt poflit cortexferrum in aqua fuftinere. Sit aqua illa in vafe autfcypho vitreo fatis amplo, Corticem rotundumpaulatim acutillimo cultello (ita vtmaneat rotun-dus)circumfecabis5donecfub aqu^ fuperficie vnoaut altero digito maneat immobilis $ & filum fit sequi libratum. Sic. DE MAGNETE^
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