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

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[251.] SCHOLIUM 3.
[252.] CAPUT XXIX. De Legibus Elaſticitatis.
[253.] Definitio.
[254.] Machina Qua Experimenta de Elaſticitate inſtituuntur.
[255.] Experimentum. i.
[256.] Experimentum 2.
[257.] Experimentum 3.
[258.] Experimentum 4.
[259.] Experimentum 5.
[260.] Experimentum 6.
[261.] SCHOLIUM.
[262.] FINIS LIBRI PRIMI.
[263.] PHYSICES ELEMENTA MATHEMATICA EXPERIMENTIS CONFIRMATA. LIBER II. Pars I. de Gravitate, & Preſſione Fluidorum. CAPUT I. De Gravitate partium Fluidorum, & illius Effectu in ipſis Fluidis.
[264.] Bilanx Hydrostatica.
[265.] Experimentum 1.
[266.] Experimentum 2.
[267.] Experimentum 3.
[268.] Experimentum 4.
[269.] Experimentum. 5.
[270.] Experimentum 6.
[271.] CAPUT II. De Actione Fluidorum in Fundos, Latera, & Opercula, vaſorum quibus continentur.
[272.] Machina
[273.] Experimentum 1.
[274.] Experimentum 2.
[275.] Experimentum 3.
[276.] Machina Qua demonſtratur Preſſio Fluidorum lateralis.
[277.] Experimentum 4.
[278.] Experimentum 5.
[279.] Follis hydrostaticus.
[280.] Experimentum 6.
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223139MATHEMATICA. LIB. I. CAP. XXIII.
Experimentum 10.
Suſpenſis globis, ex argilla molli, æqualibus P & Q, ſint
11517. hi in contrarias partes moti, P velocitate ſex, Q velocita-
22TAB. XXL.
fig. 2.
te quatuordecim, poſt ictum velocitate quatuor motum con-
tinuat, Q ſecum ferens P.
Quia propter maſſas æquales hæ unitate deſignari poſſunt,
producta maſſarum per velocitates ſunt 6.
& 14. , quorum
differentia eſt 8.
, quæ diviſa per ſummam maſſarum 2, dat
velocitatem poſt ictum quatuor.
Experimentum 11.
Non differt experimentum hoc à colliſione in Experimen-
33518. to 7.
memoratâ, poteſt autem velocitas corporum 44TA. XXIL.
fig. 1.
ictum ex nunc demonſtratis determinari.
55511.
Multiplicando maſſam E per velocitatem 17. , habemus 51;
ſubtractis 6, producto maſſæ 2 per velocitatem 3, reſtat 45;
quibus diviſis per 5.
ſummam maſſarum, habemus velocita-
tem novem Experimento detectam.
Si corpus unum quieſcat, ex utrâque regulâ ſequitur cor-
66519. poris moti productum velocitatis per maſſam dividi debere
per maſſarum ſummam.
Experimentum 12.
Globus P ex argillâ molli in globum æqualem quieſcen-
77TAB XXI.
fig. 3.
tem Q, velocitate decem, incurrit, poſt ictum ſimul velo-
citate quinque motum continuant.
Corpus in motu alii corpori ſine impactione motum com-
88520. municare poteſt, in hoc tantum preſſione agendo;
in quo ca-
ſu ſi preſſio qua partes cohærent inter ſe ſuperet preſſionem
corporum mutuam nulla datur partium introceſſio, &
nulla vis
deſtructa :
ideoque ſumma virium ante & poſt 99488; eadem eſt.
Ut autem demonſtremus quomodo corpora mota, preſſio-
1010521. ne in alia, ſine impactione, motum communicare poſſint, con-
1111TAB. XXI.
fig 4.
cipiendum eſt corpus Q, quod formatur revolutione figuræ
a b c d (quæ ſemicirculo &
duobus quadrantibus termina-
tur) circa axem a c.

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