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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 73, page id 1677894601:0083
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=83
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# Model: FoNDUE-GD_v2_ft_Leibniz, run 74, 2026-09-06T16:05:13Z — 34 lines, status machine
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nhole aperture is four tnches, and length an hundred Fcct,
IE excecds nOt 2 45, Or 3. And in a Velescope nhose
aperture is tro Tnches, and lenoch 20 or 30 Feet, it may
BC s’Or 6’and scarce abore. And chis Ansivers well EO
Experience: For Pome Asronomers have found che Dia-
Meters OF Fhe AXE STarS, in Telescopes oF BCtWWCCn EvenEy
and lixey Fcet in leneth, eo bc abour + Or 5 Or ac most
S in Diameter. But it che Fre-Clals be tincted Faincly
wich che lnoke oF a L amp or Torch, eo obscure the Lighe
OF che Scar, the Fainter Liohe in the circumterence oF the
Star ceales co be risible, and the Scar (it che Class be suffici-
enely Coiled mich Cinoke) appears lomechins more like aNI2-
themarical Poinc. And FOr the Came reaION, FHC CnOROUS
part oFche Lighe in che Circumterence ot every lucid Poine
oughe co be lels discernable in Phorter Pelelcopes than in
longer, becaule che Phorcer transnit lels Lighe co the Fyc.
Nou il e suppole che sensible Image oF a lucid pOint,
to be eren 250 times narrover than che aperture ot che
Clals: yet vere ic noc for the ditterent retrangibiliey ot che
Rays, ies breadch in an 100 Foor Pelescope whose aperture
is 4 Inches woula be buc , 6ô Parts oF an Tuch, 25 is ma-
nifest by che foregoins Computation. And cheretore in
chis Cale che greatest Errors arising from che (pherical Figure
ot che Clals, vould be to che greatest sensible Errors ari-
Cins trom che differene retrangibilier oF che RaYS a5 360̂0000
EO  at nost, thac is onty 25 1 +0 1826. And chis sutt-
cientr Phews chac ic is noc che spherical Pioures ot Classes
buc che differene retrangibilier of ihe Rays irhich hinders thc
perfection ot Pelelcopes.
There is anocher Rroument by irhich ic may appear chac
the different retranoibilier oF Rars, is the cruc Cause ot che
imverfection of Telescopes. For che Errors of che Rays
aritins trom che spherical Figures of Object-Clalles, are a5
che