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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 69, page id 1677894601:0079
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=79
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# Model: FoNDUE-GD_v2_ft_Leibniz, run 74, 2026-09-06T16:05:13Z — 34 lines, status machine
# Lines: 34 recognised, mean confidence 0.93
# Machine transcription. Not an edition. Errors are expected: about 8% character error rate on Latin and French lines, higher on German.
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midale of che Colours, and chen the faint Fnds ot che
Spectrum being remoretrom the Axis, cast their Species lels
distinetlr on che Paper than cher vould have done had che
Axis been successirely directed to chem.
Now by nhac has been said ies certain, chac che RayS
which differ in retrangibilicy do nor converge to the lame
Focus, buc it cher Aon trom 2 lucid poinc, 25 Far From
the Lens on onc sde as their Foci are one the other, che
Focus of the most retranoible RayS PMaII BC nearer tO che
Liens chan chac oF che least retrangible, by abore the four-
ceenth pare oF che whole distance: and it cher Row trom a lu-
cid poine, (0 very remore trom che Lens thar betore cheir
Incidence cher may be accoinred Parallel, the Focus oFche
most retrangible Rars Phall be nearer coche Lens than che
Locus ofcheleastretransible, br about the 27th or28ch ParE
oF cheir irhole distance From ic. And che Diameter oF che
Circle in the midele space becreen thole trro Foei which
cher illuminate when cher fall chere on any Plane, perpen-
dicular eo che Axis Cirtrich Circle is the least into irtich
chey can all bc gachered) is about che 55ch parc oF theDia-
meter ot che aperture oF che Cla(s. So chac tis a wonder
chac Telescopes reprelent Objects (0 distinet asther do. BUE
ivere alt che Rays oF Lighe equally retransible, the Error
arilins ouly from che sphericalnels ot che Figures oF Clastes
vould be mans hundred times lels. For il che Object
Class of a Telelcope be Plano-convex, and che Plane (ide
be curned comards che Object, and che Diamerer ot the
Sphere Whereotchis Clals is a segment, be called D, and chc
Semidiameter oFthe aperture of the Clals bc called S, and
che sinc ot lncidence out of Clals into Rir, be co the sine et
Retraction a5 ItO R: che Rars which come Parallel co che
axis oF che Cla(S, Chall in che Place where che lmage of the
Object is mot distinctly made, be scarrered all orer a lictle
Circle.