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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CORPORUM FIRMORUM.
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altitudinis, & </
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">plus minuſve ab ea proportione diſcedit, fiet prima
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aberratio: </
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mæ notæ, non nodoſum, non intortis fibris, ſed mere rectis con-
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ſtans; </
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<
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doſa, & </
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<
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">partim fibris rectis, partim flexuoſis conſtet; </
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<
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iterum Cohærentia Ligni in Experimento examinati & </
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trabis non accurate reſpondebit proportionibus craſſitiei, altitudi-
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nis, & </
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<
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xml:space
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">prout Trabs fuerit humidior ſicciorve, in
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calidiori vel frigidiori excreverit regione, annoſior aut tenerior fue-
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rit, magis minuſve firma erit: </
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<
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">Progreſſum itaque ope Experimen-
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torum noſtrorum aliquem utcunque exiguum, me in Phyſica feciſſe,
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& </
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<
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">præſtitiſſe opinor ea, quæ fundamenta manere poterunt hujus do-
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ctrinæ, nequaquam Firmitatis doctrinam penitus abſolviſſe.</
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<
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">Poterunt autem ex noſtris Experimentis firmitates Lignorum
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diverſorum cognoſci, comparando pondera Cohærentiam expri-
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mentia, quæ appenſa fuerunt parallelopipedis æque altis, latis,
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longiſque, atque deprehendentur ſecundum hanc proportionem Fir-
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mitates eorum reſpectivæ.</
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Quercus. # Ulmus. # Fraxinus. # Picea. # Tilia.
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15 {405/2178}. # 7. # 19 {19/135}. # 11 {1/2}. # 12 {207/289}.
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">Quia tamen plurimorum corporum firmitates appropinquant ad
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proportionem, duplicatæ altitudinis, eam aſſumere poterimus, ut
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ſupra, tumque plurima pulcherrimaque exhiberi poterunt Theo-
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remata, quæ nunc aggredior.</
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C E F, impoſitum duobus fulcris A & </
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pondus P, erit hujus Cohærentia, ad eam quam haberet, impoſito
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latere A F C B fulcris, uti eſt B C ad E C:</
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<
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ac hic repræſentatur, in ratione compoſita ex E C latitudine & </
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plicata altitudinis C B. </
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. </
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tia ejuſdem parallelopipedi impoſiti lateri A F C B, in ratione </
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