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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 38, page id 797435492:0066
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# Lines: 32 recognised, mean confidence 0.85
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Peorcua e to eicea ractos pacatetos coletacanculacu,
compendio leenes e iite cenpeccetn uben asniCte, pa
rallelorum le tes eletu Paccous Lacor ba
quond porcors ncectonem, lcent eccun cun sfte eo
caris paicidus incidentium. moco ctalOSCa CBSIEL MaIa
duare parallelorum radiaciones examann  opus contenas
Parces a concaris distinsuere, cn ete cu  s Les
Polthac aiceetaster Cracec. Ls actoes, d cadura sacct ccassuu.
ex quu propoluimus instituenda pbe ctaom sequenti
relervamus.
LC
I. D, Ojam prorecti sumus, ut radianris (a sensibilirer finita dictan-
Lscia) puincti locum apparentem inrestisemus, illum nempe qui
relultat, cperacta ad planam superticiem retractione; nec non respe-
etu risus extra radiationis axem constituri. Ouorsum imprimis spectat,
ut rectam determinemus lineam, in qua locus ille verlatur; tum ut
Cingulare designemus in illa recta punctum, circa quod exquilite con-
Cctit. Utriusque quaesiri gratia conticiendum, (imo penitius excutien-
endum) venichujusmodi Problema:
II. Dato puncto A, inpositione daram rectam F. F radiantet, desig-
nandus est incidens, qui per alterum transeat datum punctum.
TII. Si datum punctum alterum (pura jam R) in recta A B existat,
ad retringentem P. F perpendiculari Problema planum exit, ac ica Faci
le conficietur. In primo catu (quando scilicet I L R) Hac AB. YB
:: VI9 - Rg. I. iremque tatR B. T:: VIq - Rg. R, AIm Cen.
ero Y interrallo T descripens circulus iplam F F secer in N; conne-
EtanEUMEqLE ANI, KN; exit R N a iplius AN retractus.
Itidem in secundo calu (ciim I=  R) Hat R B. ZB:: V R9. -
19. R. AB. T:: VR9 --I9. I. centroque T interrallo T descri-
bacur circulus ipsi EE occurrens in H; exirque rursus K N a ipsius
AI
F1B. 4049.