Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1196[Figure 196]
Corol.2. Et undarum majorum vel minorum ve­
locitas augebitur vel diminuetur in ſubduplicata
ratione latitudinis.
LIBER
SECUNDUS.
Hæc ita ſe habent ex Hypotheſi quod partes
aquæ recta aſcendunt vel recta deſcendunt; ſed
aſcenſus & deſcenſus ille verius fit per circulum,
ideoque tempus hac Propoſitione non niſi quam­
proxime definitum eſſe affirmo.
PROP. XLVII. THEOR. XXXVII.
Pulſibus per Fluidum propagatis, ſingulæ Fluidi
particulæ, motu reciproco breviſſimo euntes &
redeuntes, accelerantur ſemper & retardantur
pro lego oſcillantis Penduli.
197[Figure 197]
Deſignent AB, BC, CD,
&c.
pulſuum ſucceſſivorum
æquales diſtantias; ABC
plagam motus pulſuum ab
Averſus Bpropagati; E,
F, Gpuncta tria Phyſica Me­
dii quieſcentis, in recta AC
ad æquales ab invicem di­
ſtantias ſita; Ee, Ff, Gg,
ſpatia æqualia perbrevia per
quæ puncta illa motu reciproco ſingulis vibratio­
nibus eunt & redeunt; ε, φ, γ loca quævis inter­
media eorundem punctorum; & EF, FGlineolas
Phyſicas ſeu Medii partes lineares punctis illis in­
terjectas, & ſucceſſive tranſlatas in loca εφ, φγ &
ef, fg.Rectæ Eeæqualis ducatur recta PS.
Biſecetur eadem in O,centroque O& intervallo
OPdeſcribatur circulus SIPi.Per hujus cir­
cumferentiam totam cum partibus ſuis exponatur
tempus totum vibrationis unius cum ipſius parti­
bus proportionalibus; ſic ut completo tempore
quovis PHvel PHSh,ſi demittatur ad PS
perpendiculum HLvel hl,& capiatur Eε æqua­
lis PLvel Pl,punctum Phyſicum Ereperiatur

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