Musschenbroek, Petrus van
,
Physicae experimentales, et geometricae de magnete, tuborum capillarium vitreorumque speculorum attractione, magnitudine terrae, cohaerentia corporum firmorum dissertationes: ut et ephemerides meteorologicae ultraiectinae
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tantundem Auſtrales; </
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">qui eventus iidem obſervabantur remotis a
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ſe ſtylis 2 {1/2}, 2, 1 {1/2} pollicibus, verum propius his admotis, conver-
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tebantur Verſoria atque cuſpidibus alterni nominis ad ſe accedendo
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in mutuos ibant amplexus.</
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breviori ad Ortum longioris.</
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">Poſito Verſorio longiſſimo in Meridiano Magnetico, alterum
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admotum fuit, ſed in eodem Meridiano; </
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<
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">tum utriuſque directio
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in eodem Meridiano permanſit, cuspide Borea unius ſpectante
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Auſtralem alterius, idque obtinebat in qualibet diſtantia centro-
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rum a ſe, modo ſe non contigerint.</
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">Ambobus eundem Meridianum ſervantibus, fuit alterutrum
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manu converſum, ejuſque cuſpis Borea ad Occaſum firme retenta,
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tum cuſpis Borea alterius quoque directa fuit verſus Occaſum ſpon-
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te, a vero tamen Occaſu aberat pluribus paucioribuſve gradibus,
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prout centra ſibi propius fuerint, vel latius removerentur.</
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">EXPERIMENTUM CXXX.</
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">Tandem poterant duo Verſoria ſupra ſe invicem locari, ut am-
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borum ſtyli eſſent in eadem recta ad horizontem perpendiculari, & </
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proinde ambo Verſoria in diverſis planis: </
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">tentamina cum hiſce varia
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inſtituit quondam Cl. </
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<
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">de la Hire, quæ inſeruit L’Hiſt. </
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cad. </
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tore depromenda ratus fui.</
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">Sumſit capſulam inſervientem Compaſſo, inſtructam circulo cu-
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preo diviſo in 360 gradus; </
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<
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">ex cujus medio centro eminebat cuſpis,
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cui imponebatur acus, libere mobilis, 3 {1/2} pollices longa: </
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tamdiu convertit, donec Acus reſpondebat gradui 360°. </
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mellæ vitreæ beneficio capſulâ clauſâ, ſumſit aliam Acum Magne-
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ticam æque longam ac prior, quam tantummodo impoſuit lamellæ
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vitreæ, ita ut ſuâ cuſpide reſpiceret Septentrionem, ſive ut hujus
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cuſpis eſſet directe ſupra cuſpidem Acus in capſulâ, & </
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tudo hujus eſſet parallela longitudini alterius: </
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proinde jacebat immobilis: </
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