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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 97, page id 797435492:0153
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E. E C T. XIV.
depretenduntur): addo, confusionis evitandx causa Cymbolum Y
dehinc in his exemplis perpetuo majorem proporrionis retractiones
dimetientis terminum denotare, quocunque de medio in quodcunque
peragatur retractio. Porro, medium primum intrinsens perpetuo
denlius incelligatur rariori circundatum. item, in figuris appolicis
litera C denorar centrum anterioris circuli, R centrum posterioris;
B verricem anterioris, D verticem posterioris, denuo delignat Y
locum imasinis qualitam.
Hilce praemonitis, primum de longinquo radiantium, Peu paralle.
los ejicientium radios punctorum imagines, prolenrium rarietate, lic
detexIMAnEUT.
I. Ad lentem plano. Convexam.
II. Ad lentem pl ANO- COnCaVam.
Fiat I = R. R:: DK. DY.
In Virro cstDY = ZKD.
In Aqua est DY = 3RD.
III. Ad lentem convexo- planam.
IV. Ad lentem concavo. planam.
Fiat SI = R. I:: BC. BZ; _
I. R:: DZ. DY
In VisroDY = ZBC - =BD.
In Aqua D X = 3BC = = BD.
V. Ad lentem ConDEXO ConVexAM.
VI. Ad lentem Concavo- concavam.
I= R. l:: BC, BZ3 _
Fiat 
RHZ = DZ. DZ::DR. DX.
C OrOll. Ad iniceram Spharam.
Fiat 2I = 2R. l: :CD. CX0
VII. Ad lEntEM SONVEKO-COnCaVaM.
VIII. Ad lenteM CONSAVO CONDEXAM.
Eiae I = R. I:: BC, BZ. 
F18. Y51.
E18. 15T.
e18. 152
EIB. 252
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