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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 105, page id 1677894601:0281
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=281
# Source image: https://digitale-sammlungen.gwlb.de/content/1677894601/jpgs/default/00000281.jpg
# Model: FoNDUE-GD_v2_ft_Leibniz, run 74, 2026-09-06T16:05:13Z — 32 lines, status machine
# Lines: 32 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.
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# After the first blank line: the recognised lines in reading order, one per line.

F
BD. L2.
When the beam oF the SunsLisht was resected back
trom the Speculum not directir to the Hole in theWin-
dorr, but to a place a little dictant trom it, the common
CentEF OFthat SpOL, and oF aII the Rings oF C OlOurS FeII
in the middle rar betreen the beam ot the incident
Lishe, and the beam of the reRtected Lighe, and by
consequence in the center of the spherical concarity ot
ehe Speculum, Wrhenerer the Chart on wrhich the RinOS
OF Colours Fell ras placed at that center. And as the
beam oE rellected Light by inclinins the Speculum re-
Ceded more and more trom the beam ot incident Lisht
and trom the common center ot the coloured Rines be-
tircen them, thole Rines greir bigger and bigger, and
10 also did the irhite round Spot, and ner RingsOFCO-
lours emerged successirelr out ot their common center,
and the rhite Spot became a Wrhite Rins encompalIns
them; and the incident and reflected beams ot Light
alirars Feil upon the opposite parts otthis Rins, illumi-
natins its perimeter like tro moek Suns in the oppolite
Darts oF an Tris. S0 then the Diameter oF this RII8,
meatured From the midale ot its Lioht on one side to
the midele oF its Lixlit on the other side, ras alvays
equal to the distance betreen the midale ot the incident
beam ot Light, and the midale of the reftected beam
measured at the Chart on irhich the Rinos appeared:
And the rays wrhich Formed this Ring vere rellected by
che Speculum in Angles equal to their Angles oF InCI
dence, and by conlequence to their Angles oF retraction
de cheir entrance into the Clals, but y et their Ansles ot
reHexion