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

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page |< < (134) of 824 > >|
218134PHYSICES ELEMENTA manifeſtè virium inæqualitatem indicat.
Hæ autem duæ cavitates conjunctæ æquales ſunt cavitati
ſoli quæ in præcedenti experimento fuit formata, &
ita an-
te demonſtrata cum Experimentis his exactiſſime congruunt.
11464. Si enim, adhibito Circino Proportionum conferamus ſoli-
da ſimilia, quorum latera homologa ſunt diametri trium
cavitatum, S, T, V, (Fig.
3.) in duobus ultimis experimentis
formatarum, videbimus cavitates has eſſe inter ſe ut unum,
duo, &
tria; id eſt majorem æqualem eſſe duobus mino-
ribus ſimul ſumtis.
Quod etiam ſequenti experimento
patet.
Experimentum 5.
Firmato obice N, in hunc impingat velocitate quinque
22504. cylindrus F;
ſublato hoc & ſuſpenſo cylindro D, impingat
33TAB. XIX.
fig. 6.
hic velocitate decem in obicem, incurrendo in ipſam cavita-
tem jam formatamictu cylindri F;
cavitatem augebit & hæc
nunc valebit ambas cavitates in Exper.
præcedenti 4to. for-
matas , &
erit æqualis cavitati V (Fig. 3.) Exp. 44464.timi.
Circa hoc Experimentum 5tum. notandum aliquando ictu
55505. argillæ ſuperficiem compactiorem fieri &
elaſticitatem quan-
dam acquirere in quo caſu Experimentum non procedit.
Semper autem obſervavi cavitatem, duobus ictibus quibuſ-
cunque formatam, ſi corpus quod ultimum impingit non
reſiliat, æqualem eſſe duobus cavitatibus, quæ iiſdem icti-
bus ſeparatim formari potuiſſent;
ſi vero corpus in cavita-
tem incurrens quantumvis parwm reſiliat indicium habemus
elaſticitatis argillæ, &
in tali caſu cavitatem ex duobus icti-
bus minorem ſemper detexi ſummâ cavitatum ſeparatarum,
eoque minorem quo ictu acquiſita elaſticitas major erat, cla-
re autem patet partes elaſticas argillæ difficilius intropremi
quam aliæ quæ elaſticitate deſtituuntur.
Sequenti etiam
experimento, quod jam præcedentibus patuit, alio modo
demonſtramus.
Experimentum 6.
66506.
Incurrant in ſe mutuo uterque velocitate quinque, cylin-
77TAB. XIX.
fig. 7.

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