# Leibniz Legible — https://leibnizlegible.com
# Page: https://leibnizlegible.com/page/1677894601:0078
# Permalink to this reading: https://leibnizlegible.com/page/1677894601:0078?run=74
# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 68, page id 1677894601:0078
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=78
# Source image: https://digitale-sammlungen.gwlb.de/content/1677894601/jpgs/default/00000078.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.
# 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.

When I obserred che deepest sensible Red, and deepest
sensible. Violet, (che corrected distance of which Colours
When all chines ivere orderedco che bekt adrancage, andchc
Sun Chone very clear, was about Or is parrs ot che length
oF che rectilinear sides oF che coloured Specerum,) IFound.
che difference oF che distances of their Foci trom che Lens.
Cometimes  Pometimes 5:, and tor che most parts Tuches
Or chereabouts: and 25 21. E0 12, Or 15 t0 26, (0 is fire.
Inches. 10 5: Or 5= Inches.
And by chis progression oF Experiments I Cacissied my
SelF, chac had che liphe acche very Ends of chespectrum been
Arons enouph ro makie che species ot che black Lines ap-
pear plainty on che Paper; the Focus ofthe deepest Vio-
Tet ould hare been Found nearer co che Lens, than the Fo-
cus oF the decpest Red, by abour s: Tnches ax least: And
ehis is a Furcher Fvidence, chac the Sines ot Incidence and
Retraction ot che several COrts ot RayS, hold che same pro-
portion. co one anoctrer in che smallest Retractions nhich
cher do in che orcacest.
Hy proorels in makine chis nice and tronblelome Fxpe-
riment l. have sec donnmore at large, thac cher chac PaII
ery ic atcer me may be avare of che Circumspection res
quisite eo make ic succced well. And il cher cannor make
it succced (o well as I did, cher mar nocwichstandino col-
lect by che Proportion ot the distance ofche Colours in che
Spectrum, co che difference of. the distances ot their Foci
From che Lens, wtrat mould be che succels in the more di-
Aant Colours by a becrer Trial. And vet il ther ule a
broader Lens chan I did; and Eix ic to a lone sreiohe Staf
by means ot which ic mar be readily and cruly directed co
che Colour whose Focus is delired, I question noc buc che
Experimene will succced beccer wich ehem chan ic did. wich
me. For I directed che Axis as nearls as I could 1o the
midole