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

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[641.] Definitio 5.
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[642.] Definitio 6.
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[643.] Definitio 7.
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[644.] Definitio 8.
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[645.] CAPUT VIII. De Phænomenis Telluris ſuperficiem, & peculiares hujus partes, ſpectantibus.
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[646.] Definitio 1.
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[647.] Definitio 2.
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[648.] Definitio 3.
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[649.] Definitio 4.
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[650.] Definitio 5.
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[651.] Definitio 6.
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[652.] Definitio 7.
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[653.] Definitio 8.
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[654.] Definitio 9.
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[655.] Definitio 10.
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[656.] Definitio 11.
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[657.] Definitio 12.
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[658.] Definitio 13.
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[659.] Definitio 14.
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[660.] Definitio 15.
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[661.] Definitio 16.
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[662.] Definitio 17.
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[663.] Definitio 18.
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[664.] Definitio 19.
Page: 733 (138)
[665.] Definitio 20.
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[666.] Definitio 21.
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[667.] CAPUT IX. De Phænomenis ex motu Axeos Telluris.
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[668.] CAPUT X. De Stellis fixis.
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[669.] Definitio I.
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[670.] Definitio 2.
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648(77)MATHEMATICA LIB. III. CAP. XVII.
Experimentum 3.
Detur fruſtum vitri, craſſitiei duorum pollicum; dentur
variæ laminæ ejuſdem vitri, quæ, ad ſe mutuo applicatæ,
omnes ſimul craſſitie duos pollices non æquant; hæ minus
erunt tranſlucidæ, propter aërem interjectum inter laminas,
quàm fruſtum cujus omnes partes cohoerent.
Experimentum 4.
Dentur, ex eodem vitro, duodecim laminæ, quantum
fieri poteſt ejuſdem craſſitiei; ſex & ſex ad ſe invicem ap-
plicentur; ex duabus hiſce congeriebus ſi minus tranſlucida
aquæ immergatur, extracta, tranſluciditate, aliam vincet;
quia aqua, quæ in hoc caſu interſtitia inter plana replet,
denſitate cum vitro minus differt quàm aër.
Confirmantur ulterius, & extra omne dubium ponuntur,
quæ de opacitate dicta ſunt innumeris experimentis, quibus
corpora perfectè tranſlucida, ſeparatione partium, non in-
11844. terveniente corpore ullo opaco, opaca fiunt.
Experimentum 5.
Agitetur liquidum quodcunque, perfectè tranſlucidum,
quod in ſpumam poteſt converti, donec in bullas extenſum
ſit; ſtatim opacum erit, ex interſtitiis aëre repletis.
Experimentum 6.
Reſina terebinthina, & aqua, ſunt corpora tranſlucida;
commixta corpus formant opacum.
Experimentum 7.
Aqua & oleum commixta ſunt opaca; licèt ſeparata ſint
tranſlucida.
Experimentum 8.
Vitrum quantumvis tranſlucidum, ſi in pulverem redi-
gatur fit opacum. Etiam ex rimis in vitro hoc opa-
cum eſt.
In hiſce omnibus clarè videmus opacitatem dari, quia
inter partes tranſlucidas interjacet medium diverſæ denſi-
tatis; quod etiam in nubibus obſervatur, quæ opacæ ſunt
ex aëre inter aquæ particulas interpoſito.
Si hiſce addamus, quæ de tenuium laminarum coloribus
in capite 22. ſequenti dicuntur; nova habebimus

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