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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 113, page id 797435492:0185
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L E C T. ZVI.
R. T; erit quidem Z P imago rectae F P absolura; at ejusdem imago
relata (Puta P8 P 5) ultra PF R jacet, ab illa sensim reclinans; c-
jusque puncta qualibet ita sionantur. Ab O ducatur recta OK. uE-
cunque rectam P  secanS in M, _ TII R M iplIuS FM retractus,
tum (posiro rursusS =. V I9 - R 9) hat PII =
SgXPMAPM.
LgXPFC
_ per H adl P F parallela ducatur HI ∞, ipsam O M R intersecans
ado; eric punetum e in dicta linea, punctum scilicet F reprxsentans.
eodem que modo puncta quorliber alia deprehendes.
VIII. Similiter rectae FC ad iplam P O parallelx, vel inclinata
imago relata a a r (in partes arcuata contrarias illis, ad quas prioris.
casus imago videbatur incurrata) determinabitur. rem appolita figura
latis exprimit.
Hlxc autem omnia de supra comprobatis dilucide consectantur.
IX. Ac ita quidem circa simplices planas superficies retrinsentes Fi8. 185.
Peleres habet. Ouod si corpori parallelis planis M NF, uV terminato
exponatur recta FC; Sint recta FP, C9, ADBO ip(I PO
perpendiculares, _ HatBD. BS: : P. R; adlumaturque Aa =DS;
_ Hat AB, a6:: F P. XP; _C per X, a ducatur recta X a Y, erit
X aY linex F AC imaso absoluta. Ergo ejus imago ad oculum O
relata (in hoc casu) cirra iplam Xa Y versus superficiem ur nonnihil
incurrara disponetur, qualem extribet linea e a v. id quod ex eo latis
videtur liquere; quod recta X a Y Ci imaso respectu oculi in ipla
OB a B infinite semoti. delignari vero porerie hxc imago ad hunc
modum. Sic fac (minusculis elementis indisitara) imaDOrectRF AC
ad superticiem refringentem ur relata (hoc est ad oculos in retractis
EpM, QVN, a DB, reliquisque, nec non in medio MVM N vertuS
Oprorenso, (It05) junta proxime commonstrata delincabilis. tum
hujus ipsus fac relut inmedio M NTur vertus A protenso POLIIX, CX
retractione ad superticiem M NI eniergens, e ad oculum Orelata
construatur imaso paq. (itidem ad modum nuperrime praescriptum)
haecrectam FA C per COrDUS MNVuV spectatam reprasentabit. ex
periencia reltis adrocetur, eso pluribus in re perplexiore, quam uri-
liore supersedeo.
Z. Porro quod plans specnta (limplicia, vel compolita) actince,
in iis palam est imagines absolutas ac relaras omnino libi coincidere;
quo EE, ut ex objectorum magnicudines, tisuras, distantias (Tiu
EAMEM