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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 103, page id 797435492:0163
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P E C T. ZIY.
Fnjusmodi Vitrum AEropes juvat; pro quibus ita conttruatur:
sit Z. D distantia, ad quam optime cernune; Pumaturque Z B utcun-
que paullo minor quam ZD; ec fiat C B = ZZ B; TM CCHEO C
per B describatur circulus F BF, _ CeNtrO Z per D circulus OD HI
describatur; ip(i (Supexticiei CD E oculum adtmOVeNtES) punctum
Adistincte spectabunt, velut ad L Citum.
Duod si velit Mrops, ad distantiam iridem Z D distincte cernens,
altienatum punctum A contemplari; ad sumpto, ut priis, libere.
puncto B, HaE C B -
2 ABX L B
5AB -3 ZB; e reliqua tiane, ut prius.
II. Dati puncti  perfectam imaginem, etiam ope lentis concavo- F18. 164.
convexa, in datum aliud punctum Z lor girquius projicere.
FiaE AZ. AD:: I -R. RE. item diridatur A D in C, UE SIECD.
C A:: I. R; _ CentrO C per D describatur circuluS F DF. item
centro a, quopiam incervallo A B (minori quam AD) describatuE
circulus F D F; factum erie; nempe lens FD F puncti A ina-
einem in punctum Z projiciet.
Data C B, puncta A; Z vicilsim e propolicis innotelcune.
In vitro, (IC B = 75, Cric
L.C = 9.
ZB = 24
CSAZ =- 16.
CAB = 40.
Uridem ex hic, per lentem P. L versus Z cendentes radii in A retrin-
GUBEUE.
Flinc. Presbyris urile conficiatur Virrum, hoc pacto: Ad incerral-
lum Z. Dhi distincte videane. Secetur Z D in A, uE liE AD = - ZZD..
item (It C D = Z AD (vel (IC D = 3ZD) CenErOque C PEF D.
describatur circulus FD F. item urcunque sumpeo puncto B (citra
D. nempe, versuS A) CentrO A per B describatur circulUS E BF.
lenre P F dicti Presbyta punctum A distinetistime conspicient.)
Flisce demum in cumulum adjiciacur ab amico communicatus Modus
elesans ac expeditus cuiu scunque casus imaginem Geometrice desig
nandi; ut es lentem describendi, qua imasinem in datum punctum
prostotet.
I. Imarinem destenare.
Eceneris, e verricibus circulorum lentem constimentium exigan- F18. 165,
tur ad axin perpendiculares RI, BP, D(, C. L; deinde per punctum 166, 167.
A ducatur quaeris recta A P I secanS P P, _C l in P, 4 I. tac CI.
CR:: I. K. agatur recta R P SCCanS DO, e Re in , ece; TaC
R8. Kj:: R. I, et agatur 2 O, quae producta lecabir arin in Y, l0c0
imas inis. qux FitO. 1
26. c0