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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DE MAGNETE.
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tur: </
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">hæ bales ſunt totius operis, his bene poſitis, Magneti poterit elegans
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quæcunque induci forma, cubica, parallelopipeda, vel quæcun-
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que alia deſideratur, a locis enim polaribus omnis virtus Magnetica
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exſpectanda eſt, & </
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<
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xml:space
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">Notandum hic imprimts eſt,
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nunquam Magnetem eſle abbreviandum, locis polaribus bene appla-
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natis, quia abbreviando ſemper aliquid ſuæ virtutis amitteret, ve-
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rum poſſunt abſque detrimento alia latera circa axin abſcindi, uti
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Vallemontius, aliique plures recte animadverterunt.</
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<
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">Formentur deinde ex Ferro molliſſimo, in quo nullæ ſunt ſpinæ,
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aliquot corpora illius formæ, quam fig, 4. </
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A B C D pars tenuiſſima, longitudinis & </
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">latitudinis ejuſdem ac to-
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tum latus polare armandi Magnetis: </
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">ad angulum rectum inflexam
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habeat partem E F craſſiorem, inferius rotundam, ſive in promi-
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nentiam deſinentem, quæ Pes Armaturæ vocari ſolet.</
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<
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">Obſervandum eſt in formando hoc pede a fabro, ut B E ſit pars
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inflexa Ferri A B, atque ita ſtriarum ferrearum ductus A B E con-
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tinuati jaceant, exercitati enim in Magnetica arte fabri obſervave-
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runt, ex pede armaturæ dicto modo formato, Magnetem plus ponde-
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ris elevare. </
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<
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xml:space
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">Monui ex Ferro molliſſimo hæc corpora eſſe forman-
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da, & </
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">non ex Chalybe, uti perverſe a nonnullis annotatum eſt,
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ex ferrea enim armatura multo plus ponderis geſtant Magnetes, quam
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ex Chalybea.</
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<
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minatu a priori eſt difficillimum: </
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">laminæ craſſitiei diverſæ & </
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gitudinis A B prius ſuper polo Magnetis ducantur, atque explore-
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tur, quænam maximis ab eo viribus imprægnetur, ſecundum Ex-
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perimentum XXXI. </
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">hujus craſſities erit ea, quæ deſideratur in
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A B C D: </
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plurimum Ferri geſtetur, conficiuntur aliquot nempe ferramenta
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A B C D E F diverſæ craſſitiei, his armatur Magnes, & </
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ſime Ferrum elevant, eliguntur. </
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applicatam, ſcobem ſpargunt, quæ ſi valde attrahatur & </
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nimis tenuem eſſe A B judicant: </
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hitur, eam minus craſſam pronunciant, atque eo uſque eſſe atte-
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nuandam, donec aliquid ſcobis attrahat.</
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<
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