Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1gentes alias quaſvis duas GCD, FDEin L& K.Per harum
tangentium non parallelarum CL, FKcum parallelis CF, KL
concurſus C& K, F& Lage CK, FLconcurrentes in R,& rec­
ta ORducta & producta ſecabit tangentes parallelas CF, KLin
punctis contactuum.
Patet hoc per Corol. 2. Lem. XXIV. Ea­
dem methodo invenire licet alia contactuum puncta, & tum de­
mum per Probl.
XIV. &c. Trajectoriam deſcribere. q.E.F.
LIBER
PRIMUS.
Scholium.
Problemata, ubi dantur Trajectoriarum vel centra vel Aſymp­
toti, includuntnr in præcedentibus.
Nam datis punctis & tangen­
tibus una cum centro, dantur alia totidem puncta aliæque tangen­
tes a centro ex altera ejus parte æqualiter diſtantes.
Aſymptotos
autem pro tangente habenda eſt, & ejus terminus infinite diſtans
(ſi ita loqui fas ſit) pro puncto contactus.
Concipe tangentis cu­
juſvis punctum contactus abire in infinitum, & tangens vertetur in
Aſymptoton, atque conſtructiones Problematis XIV & Caſus pri­
mi Problematis XV vertentur in conſtructiones Problematum ubi
Aſymptoti dantur.
Poſtquam Trajectoria deſcripta eſt, invenire licet axes & umbi­
licos ejus hac methodo.
In conſtructione & figura Lemmatis XXI,
fac ut angulorum mobi­
61[Figure 61]
lium PBN, PCNcru­
ra BP, CP,quorum
concurſu Trajectoria de­
ſcribebatur, ſint ſibi invi­
cem parallela, eumque
ſervantia ſitum revolvan­
tur circa polos ſuos B, C
in figura illa.
Interea ve­
ro deſcribant altera an­
gulorum illorum crura
CN, BN,concurſu
ſuo Kvel k,Circulum
IBKGC.Sit Circuli
hujus centrum O.Ab
hoc centro ad Regulam
MN,ad quam altera illa crura CN, BNinterea concurrebant

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