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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tem, & </
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">Magnes reciproce tantopere ad ferrum, hinc ut manerent a
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ſe ſejuncta hæc corpora; </
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<
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">pondus majus imponendum erat Lanci ad-
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nexæ oppoſito brachio I ibræ illius, ex quo Magnes pendebat, eo
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attollebatur Magnes, tum accurate tantundem ponderi imponendum
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erat ferro, a quo deprimebatur, atque a Magnete avellebatur; </
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<
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peractis æquilibrium obſervabatur in utraque libra: </
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<
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xml:space
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">Hinc igitur ma-
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nifeſto liquet, Actionem Magnetis in ferrum eſſe æqualem Reactioni
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ferri ad Magnetem: </
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<
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">idem evinci poteſt alio etiam modo, ſi nem-
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pe tum ferrum, tum Magnetem parvis inmittamus cymbulis, in
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quibus, Aqua labro amplo immiſſa, natent, accedunt enim ambæ
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cymbulæ ad ſe æquali cum impetu, & </
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<
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">in intermedia via ſibi eunt
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obviam: </
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<
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">Verum ad alia tranſeamus experimenta, in quibus opera-
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tiones Magnetis in ferrum determinare calculo conati fuimus.</
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">EXPERIMENTUM XVI.</
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">Sumſi maſſam ferream, quod erat parallelepipedum, baſeos 224
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linearum pollicis quadratarum, longitudinis 5 {1/2} pollic. </
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quam Magnetem attigerat, tabulæ id impoſui, ut immobiliter ſtaret:
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</
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">tum ſuspendi Magnetem, etiam formæ parallelepipedæ, qui Expe-
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rimento quarto inſervierat, ex fune annexo Libræ, ita ut axis,
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utrosque polos connectens, eſſet in horizontem perpendicularis, tran-
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ſiretque per axem ferri: </
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<
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">reductum Magnetem ad æquilibrium, pri-
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usquam tentamina fierent, demiſi ad varias a ferro diſtantias ſucces-
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ſive, quemadmodum in Experimento II. </
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">& </
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<
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">notavi pondus alteri
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imponendum lanci, ad æquilibrium reſtituendum, quod æquipolle-
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bat ſemper ejus viribus attractricibus: </
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<
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">eſſectum attractionis ex appo-
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ſita conſpicere licet tabula.</
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Diſtantiæ \\ pollic. # lin # Attractio. \\ gran. Medicor.
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3 # 7 # 1
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2 # 11 # 1 {1/2}
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2 # 6 # 2
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1 # 7 # 6
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1 # 4 {1/2} # 10
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# 11 # 14
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