# Leibniz Legible — https://leibnizlegible.com
# Page: https://leibnizlegible.com/page/1677894601:0276
# Permalink to this reading: https://leibnizlegible.com/page/1677894601:0276?run=74
# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 100, page id 1677894601:0276
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=276
# Source image: https://digitale-sammlungen.gwlb.de/content/1677894601/jpgs/default/00000276.jpg
# Model: FoNDUE-GD_v2_ft_Leibniz, run 74, 2026-09-06T16:05:13Z — 33 lines, status machine
# Lines: 33 recognised, mean confidence 0.90
# Machine transcription. Not an edition. Errors are expected: about 8% character error rate on Latin and French lines, higher on German.
# Licence: CC BY 4.0, Leibniz Legible. Machine output: do not ingest it as verified text; keep this provenance with the text.
# Wording rule: say "the machine reads it as …", never "Leibniz wrote".
# After the first blank line: the recognised lines in reading order, one per line.

10O
OEthe third Part of this B00k, it the rays be made ob.
lique to the Clals, the chicknels oF the Glals requia
site to transmit the lame bright Light oEthe lame Rine
in any obliguitu is to this thicknels oF: oF an Inelu, 45
the lecant oF an Ansle wrhose line is the tirst oF an hun-
dred and Ex arichmetical means betrreen the sines ot
incidence and refraction, counted trom the fine et inci.
dence wrhen the retraction is made out ofanr plated B0-
dy into any medium incompalsins IE, That 15, In tls Cale,
OUE OF GEIA(S InEO AIT. NoW if the thickness oFthe GElaIS
De increaled by degrees, (0 as to bear to its tirit thicknels.
viz. That OE a quarter oF an Lnch) the PropOTtIOnS
wrtrich 34386 (the number oF fts of the perpendicular
FayS in Soins throush the Cilals torards thewhite SpOt
in the center oE The RInGS,) hath 10 34385, 34384,
34383 and 34382 (thenumbers oF thetits otthe oblique
cays in soins throueh the Glass torards the tirst, le
cond, third and Fourth Rinos oF C olours,) and it the
ErHt thickness be dirided into 100000000 equal Parts.
the increaled thicknesses Wrill DC 100002908, 100005816,
200008725 and 100011633, and the Angles oF wrhuch thele
chickneses are secants willbe 26 13, 375, 45 6 and
2 26 theRadius beins 100000000; and the sines ot
these Ansles are 762, 1079, 132F and 1525, and the
proportional tines oFretraction 1172, 1659, 2031 anc
2345, the Radius Deins 100000. Lor since the bnes
ot incidence out oF CilaIs into AII are to the neS
Ot retraction 25 Ir t0 17, and to theabore-mentioned
secants. a5 TI to the Ars OF 10b arithmetica) means
betreen TY and 17, that 15 45 LL FO 1I 166 thole se
cants vill De to the sines ot retraction a5 11586 10. 17
and by chis Analogy ill sire chele sines. S0 chen