Gravesande, Willem Jacob 's, Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1

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398266PHYSICES ELEMENTA xeos directionem feratur, in eodem ſcholio demonſtra-
mus.
Unde ſequitur reſiſtentiam globi ſe babere ad reſiſtentiam
11916. conirecti, juxta axeos directionem moti, & cujus baſeos dia-
meter æqualis eſt diametro globi, ut duæ tertiæ partes li-
neæ, in ſuperficie coni ad punctum baſeos ductæ, ſe babent ad
ſemidiametrum baſeos.
Obſervandum coni verticem in motibus hiſce præcede-
re; ſienim baſis reſiſtentiam pateretur, clarum eſſet hanc a
reſiſtentia cylindri ejuſdem diametri non differre.
Experimentum 3.
Experimentum hoc ut præcedentia inſtituitur, differt
22917 tantum corpus in quod aqua agit. Uſus ſum cono in O
33TAB. XXXV.
fig. 1. 3. delineato, baſis diameter eſt ſemipollicis, altitudo ſemipol-
licis a vertice v ad centrum circuli qui figuram conicam
terminat, infra quam figuram conicam cylindricum erat
corpus, eratque partis cylindricæ altitudo circiter octavæ
partis pollicis. Hæc vero inferior pars corporis conſide-
randa non eſt, quia in hanc aqua, juxta axeos corporis dire-
ctionem mota, incurrere non poteſt.
Actiones aquæ in corpus tabellâ ſequenti continen-
tur.
44918.55
Velocitates # Reſiſtentiæ
1. # gr. {1/2}. - 2. # gr. 1 {1/4} + 3. # gr. 2 {1/2} - 4. # gr. 4. 5. # gr. 6. - 6. # gr. 8 {1/2} 7. # gr.
Diviſo grano in centum partes, in tabella ſequentiſe-
paramus reſiſtentias ex utraque cauſa.

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