# Leibniz Legible — https://leibnizlegible.com
# Page: https://leibnizlegible.com/page/1677894601:0189
# Permalink to this reading: https://leibnizlegible.com/page/1677894601:0189?run=74
# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 17, page id 1677894601:0189
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=189
# Source image: https://digitale-sammlungen.gwlb.de/content/1677894601/jpgs/default/00000189.jpg
# Model: FoNDUE-GD_v2_ft_Leibniz, run 74, 2026-09-06T16:05:13Z — 30 lines, status machine
# Lines: 30 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.
# 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.

retransible rays had been copious enough to male the
Rinss sensible rithout the mixture oE other rays, the
proportion which here Was 14 to 9 ould hare been a
licile greater, Cuppole 14; Or 14; 109.
OBS. XIV.
WhilE ehe Prisim was turn d about its Axis wict an
uniform motion, to make aII the leverat COlours FaII
luccessirels uxon the Object. Cilastes, and therebr t0
make the Rines contraet and dilate: The contraction
or dilation ot cach Ring thus made by the variation ot
Is Colour ras Criftest in thered, and Nomest in the
violet, and in the intermediate Colours it had inter-
mediate degrees ot celeritr. Comparins the quantity
ot contraction and dilation made by all the degrees ot
each Colour, I Found that it Wras greatest in the red;
less in the rellor, siIl less in the blue, and least in the
violet. And to make as just an estimation asl could ot the
proportions oftheir contractions or dilations, lobserved
that the Wtole contraction or dilation of the Dinmeter
OF any Rins made by aII the degrees oF red, Wras to that
oF the Diameter oF the lame Rine made by aII the de-
siees oFriolet, as about Four to three, or Aire to Four, and
chat wrhen the Lisht ras of the midele Colour betireen
vellorr and sreen, the Diameter ot the Rins Wras very
nearly an arithmetical mean betreen the greatest Dia-
meter ot the Came Ring made by the outmost red, and
the lealt Diameter thereot made by the outmost violet:
Contrary to irhrat happens in the Colours of the oblone
Spectrum made by the retraction ot a Prism, Where the
red ismost contracted, the violet most expanded, and