Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1oſcillationis unius, ut arcus HI(tempus quo corpus Hperveniet
ad L) ad ſemiperipheriam HKM(tempus quo corpus Hper­
veniet ad M.) Et velocitas corporis penduli in loco Teſt ad ve­
locitatem ipſius in loco infimo R,(hoc eſt, velocitas corporis Hin
loco Lad velocitatem ejus in loco G,ſeu incrementum momenta­
neum lineæ HLad incrementum momentaneum lineæ HG,arcu­
bus HI, HKæquabili fluxu creſcentibus) ut ordinatim applicata
LIad radium GK,ſive ut √SRq.-TRquead SR.Unde cum,
in oſcillationibus inæqualibus, deſcribantur æqualibus temporibus
arcus totis oſcillationum arcubus proportionales; habentur, ex da­
tis temporibus, & velocitates & arcus deſcripti in oſcillationibus
univerſis.
Quæ erant primo invenienda.
LIBER
PRIMUS.
Oſcillentur jam Funipendula
100[Figure 100]
corpora in Cycloidibus diverſis
intra Globos diverſos, quorum
diverſæ ſunt etiam Vires abſolu­
tæ, deſcriptis: &, ſi Vis abſolu­
ta Globi cujuſvis QOSdicatur V,
Vis acceleratrix qua Pendulum urge­
tur in circumferentia hujus Globi,
ubi incipit directe verſus centrum
ejus moveri, erit ut diſtantia Cor­
poris penduli a centro illo & Vis abſoluta Globi conjunctim, hoc
eſt, ut COXV. Itaque lineola HY,quæ ſit ut hæc Vis accelera­
trix COXV, deſcribetur dato tempore; &, ſi erigatur normalis YZ
circumferentiæ occurrens in Z,arcus naſcens HZdenotabit datum
illud tempus.
Eſt autem arcus hic naſcens HZin ſubduplicata ra­
tione rectanguli GHY,adeoque ut √GHXCOXV. Unde Tem­
pus oſcillationis integræ in Cycloide QRS(cum ſit ut ſemiperi­
pheria HKM,quæ oſcillationem illam integram denotat, directe,
utque arcus HZ,qui datum tempus ſimiliter denotat, inverſe) fiet
ut GHdirecte & √GHXCOXV inverſe, hoc eſt, ob æquales GH
& SR,ut √(SR/COXV), ſive (per Corol. Prop. L) ut √(AR/ACXV).
Itaque Oſcillationes in Globis & Cycloidibus omnibus, quibuſ­
cunque cum Viribus abſolutis factæ, ſunt in ratione quæ compo­
nitur ex ſubduplicata ratione longitudinis Fili directe, & ſubdu­
plicata ratione diſtantiæ inter punctum ſuſpenſionis & centrum

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