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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 125, page id 1677894601:0145
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=145
# Source image: https://digitale-sammlungen.gwlb.de/content/1677894601/jpgs/default/00000145.jpg
# Model: FoNDUE-GD_v2_ft_Leibniz, run 74, 2026-09-06T16:05:13Z — 34 lines, status machine
# Lines: 34 recognised, mean confidence 0.92
# 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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# After the first blank line: the recognised lines in reading order, one per line.

l125
may be about 40 degrees, the Spectator will sec a BOW
MN oF a bluc Colour, runnins trom one end of the:
bale tothe other, with the concare side torrards him,
und the part oF the base IMNC berond this Bour vill.
Dc brishter chan the other paRE PNINET on the ocher
lide ot it. This blue Colour NIN beins made by no-
thins elle than by refexion of a specular luperticies,
Peems (o odd a Phaenomenon, and lounaccountable For
by the rulsar Hypothelis oF Philolophers, that L’could
not but think ic deserred to betaken notice of. Nou
For understanding the reason oF it, suppole the plane
ABC. to cut the plane sides and base ot the Prilin per-
Dendicularir. From the Lye tothe line BC, Wrherein that
Plane cutsthe base, drar the lines Sp and SF, in the
Ansles SpC 50 degr.  and Stc 49 degr. 20, and the
Doint p ill be che limit bexond ertrich nonc ofthe most.
retransible rars can passthroueh the base of thePrilm,
and be retracted, irtiose incidence is Cuch that ther may
Berehlected tothe Fire; and the point t will bethe like
limit For the least retransible rays, that is, berond
Wrhich none of them can pals throueh the base, irhole
incidence is uch that br refexion they may come tothe
LyC. And the pointr taken in the middle war betreen
Pand F, Wrill be the like limit for the meanly retransible
raYS. And theretore aII the retransible rars irhich FaII
uxon the base berond t, that is, betireen t and B, and.
cin come trom thence to the Lye Wiil De resected thi-
ther: Buc on this side F, that i5, betreen. F and C, many
Ot thele rars wil be transmitted throush the bale.
And all. the most refransible rays wrhich FalI upon the.
bale beyond ps that is, betireen p and B, and can by
reflexion come tromthence tothe lye, will De retlected.
Thither,