. Guilielmi Gilberti Colcestrensis, medici londinensis, De magnete : magneticisque corporibus, et de magno magnete tellure; physiologia noua, plurimis & argumentis, & experimentis demonstrata . dices)in du-obus Iimbis fiue marginibus extra pcripheriam illamhuic vfui defti^natis^ deinde gradibus linesere^tse sequatoriparallelse parabis regulam fiue alhidadtfm, circuli il-lius diametro sequalem, & in eafdem omnino partes diuifam,in quasdiuifaeft circulidiameteraxemmundi repraefentans. Regulse hu-iusmedio,appendiculaqu2edam adhserens relinquaturj qu£ medi-umfiduc
. Guilielmi Gilberti Colcestrensis, medici londinensis, De magnete : magneticisque corporibus, et de magno magnete tellure; physiologia noua, plurimis & argumentis, & experimentis demonstrata . dices)in du-obus Iimbis fiue marginibus extra pcripheriam illamhuic vfui defti^natis^ deinde gradibus linesere^tse sequatoriparallelse parabis regulam fiue alhidadtfm, circuli il-lius diametro sequalem, & in eafdem omnino partes diuifam,in quasdiuifaeft circulidiameteraxemmundi repraefentans. Regulse hu-iusmedio,appendiculaqu2edam adhserens relinquaturj qu£ medi-umfiducialis Jineadpfius regula?, centro circuli conneclatur: quin-tseautemvel decimse cuiqueparti iftius regulae,numeriadiungan-tur, d centro in vtramque partem progredientes. Defignathic cir-culus, meridiani planum; centrum eius, ipfum orientis vel occiden-tis pun&um, id eft horizontis & asquatoris intcrfe&ionem mutuam;omnesillse linese sequatori sequidiftantes, folis & ftellarum paralle-losdenotantj regulse, fiue alhidadse lineafiducialis horizontem; e-iufque partes5horizontis gradus ab opcidentis orientifue punclo in-cipientes, fignificant. Itaquc I75 GVILIEL. GILBERTI. i|o 1 T j|q i ^lo^ o 1 ^jTf Sy ? Itaquc fi datae loci latitudini ab vtrouis illius diametri tcrminoquaeaxemmundi defignatnumerata:,linea regulsefiducialisappli-cetur; deinde folisvel ftella? cuiufuis data declinatio (minor com-plemehto latitudinis loci) ab aequatore in inftrumenti limboinue-niatur; paralleli ab illius declinationis pun&o du&i fe£tio in hori-zonte, vclfiduciali regula? fiue alhidadas JincS, ftella* datae, folifueamplitudinem ortiuam, ad datamloci latitudinem indicabit. CAP. DE M AGNfef fe5 LIJB. HII. C AP. xiii. Obfcruationes variationis a nauigaritibus^ plerunqd©juntyaritf & incerte: partim ab errore & infcitia> <&inftitifnentorum impcrfe&ionibu$$ partirri drriarirarditatrancjuillo^t^vmbr^ mtluminaiufi}in mfitumentts confiarefojfmu ; ]
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