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# Title: [Lectiones XVIII, Cantabrigiae in Scholis publicis habitae] Lectiones XVIII, Cantabrigiæ in Scholis publicis habitæ (shelfmarks Leibn. Marg. 0; ZEN Leibn. Marg. 0)
# Folio 87, page id 797435492:0139
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E CT. LL
1. 
Panfactis iis quae refractioni conveniunt isti, quam ad cir–
cali peripheriam subeunt radii sibimet paralleli; quid iis. ob-
venit proxime dispiciendum venit, qui a puncto quexiam (ensibiliter
divergentes itidem circulo se objiciunt refringendos. Cum aurem in hac
Hiypocheli multa reveriatur casuum varietus e pluribus caulis oriunda
(nedum enim a mediorum specie differentium ordine, vel litu versus
Ce diverso; quinetiam circuli retringentis alia ac alia, convexa nem-
De vel concara, Facie radiarioni obversa; sed ab iplius quoque radi-
antis magis aue minus a retringente semori politione conclusionum
emersit nonnulla discrevantia) nobis incumber ira rem, qua possir
mus, moderari, simul ut cum ex abstractione nimia proveniens con-
Fulio, cum e revecirione tastidium aliquoulque deritentur. id autem
non alias, opinor, commodius aslequemur quam imprimis generalia
quadam atrinsendo, cuidam unicalui (illi nempe, ubi lL. R, _
radii conreris circuli parcibus incidune). Sic applicata, ut latis Faci-
le possine ad alios quoque cransterri; tum peculiaria nonnulla sinsulis
congruentia Tubnotando. ad rem.
II. In circulum retringentem BN (cujuScenerum C) radiet pun- Fig. 129.
ccum A; e connexa A C procendatur ad urrasque partes indetinite:
tum cujalvis incidentis A N lic refractus NR, cum axe nimirum in K
conveniens, dico compolitas rationes A C ad CR, _E NTR ad NI A
aequari rationi lad R. Conjungatur enim C V, _ ducatur R H ad
CN parallela; exir isitur (ut generatim ancehac habetur osten sum)
l. R:: NR. NHI = NR. N A u) N A. AIH == NK. N A F 3 Eect. mum: 9.
AC. CK: G. F. D.
p
AII. EIinc SI fuerit C A . CR :: L. R. CTIE CR. CR::NK.
A.
Nam.