# Leibniz Legible — https://leibnizlegible.com
# Page: https://leibnizlegible.com/page/1677894601:0028
# Permalink to this reading: https://leibnizlegible.com/page/1677894601:0028?run=74
# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 18, page id 1677894601:0028
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=28
# Source image: https://digitale-sammlungen.gwlb.de/content/1677894601/jpgs/default/00000028.jpg
# Model: FoNDUE-GD_v2_ft_Leibniz, run 74, 2026-09-06T16:05:13Z — 30 lines, status machine
# Lines: 30 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.

P ROP. II. THCOT. TI.
The Lighe of the Sun consists of Pays differently Refrancible,
The PrOOF by ExpCTImeNES.
Exper. 3.  N a very dark Chamber ac a round hole aboue
B onc chird pare ot an Tnch broad made in che
SAnE oF a Nindom I placed a Class Prism, whereby che
beam ofthe suns Lighe irhich came in ac chac hole miohe
be retracted upvards corard che oppolice Wall oF che
Chamber, and there form a coloured Image ot the
Sum. Thc Axis oF che Prilm (thac is che Line passino
chrouoh the middle ot che Prilm trom one end ot ic tO
che ocher end Parallel to the edoc of che Retracting AnelC)
vas in chis and che Collowins Experimenes perpendicular
to the incidene Rars. AbouE ehis Axis I curned che PrisM
Plomly, and Par che refracted Liohe on the WaII Oc cO-
loured Image ot the sun Arst to descend and then eo a(
cend. Betreen che Descent and AIcent wrhen che Image
seemed Scationarr, IRopE che Prilm, and fixc ic in chat
Polture, chac ic Thould Be mored no more. For in thac
posture the Retractions of che Liohe ac the erro sides ot
che Retractins Angle, chac is ac che entrance of che Rays
into che Prism and ac cheir goins out oF it, vere equal eo
one anocher. S0 allo in ocher Lixperimenes as otcen a5 L
rould hare che Retractions on Boch sides ehe Prismm co be
equal to one anocher, Inored the place utere the Imase
ot the sun formed by che retracted Lighe Aood Aill bC-
LWreen IES cro contrarY Mocions, in the common Perioc
OF its proorels and corels; and nhen che Imaxe fell upon
thac place, Imade tast the Prilm. And in chis pocture, as
et