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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 67, page id 1677894601:0077
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=77
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# Model: FoNDUE-GD_v2_ft_Leibniz, run 74, 2026-09-06T16:05:13Z — 34 lines, status machine
# Lines: 34 recognised, mean confidence 0.88
# 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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che Spectrum, che ditference ot the distances ot cheir Foci
From the Lens mas aboue 4: Inches; and 25 5 106, l0 is
4= C0 52. For Cometimes when the L ens Was adrantagi-
ousty placed, Co that ies Aris respected che Blue, and aII
thines else ere well ordered, and thesun Cone clear, and
Pheld my Eye very near co che Paper on irhrich che Pens
cast che Species of che Lines, Pcouid sec preter distinctly
che Species ofthose Lines by chac part oF che Violet wrhich
was next che indipo; and lometimes P could sec chem by
abore halt che Violet. For in makeine chele Experiments
Thad obserred, thac che species ot thole Colours ontr ap-
Peared distince which ivere in ox near the Aris oFthe L enS:
So chat if che Blue or Indigo vere in the Aris, T contd see
cheir Species distincelr; and chen che Red appearedmuch
tels distince chan Betore. WHeretore I contrived eo make
the Spectrum oF Colours Chorrer chan betore, (0 thac both.
ies Ends mighe be nearer eo the Axis oF che Lens. And
non ies lensch ras abouc 2; Tuches and breadch about = Or
SOF an Tnch. AIso instead oF che black Lines on irtrich che
Specrum vas cast, I made one black Line broader chan
chole, chat L miphe see its Species more casilr; and chis
Line I dirided by Chore cross Lines inco equal ParES, FOT
mealurinothe distances oF the observed Colours. And nOW
J could Pomerimes sec che species ob this. L ine with its diri-
Tons almost 25 Far 25 che Cencers of the Senicireular Violee
tind ot che Speccrum, and made chese furcher Obserrations.
When L obserred che deepest sensible Red, and chac part
ol the Violet whose corrected distance From ic mas aboue
Parts ot the rectilinear sides of the Spectrum che difference
OFche distances ol che Foci oF chole Colours From the L ens,
was one time 4 anocher time 4 anochercime 13, Inches,
FF.
anel 25 8 c0 9, (0 are 4 13 4 3 4 5, 10 5 5 5n 55 respectivetus
W