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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 20, page id 1677894601:0030
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=30
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Such a posture chac che Retractions ofthe Rays at cheir emer-
sence out ot che Prilm miehe be equal co chac ac cheir inci-
dence on it. This Prilm had lome Veins runnino alone
richin che Class trom onc end co the ocher, which (cac-
cered lome oF che Suns Lighe irregulartr, buc had no sen
sible effect in encreasine che lenorh ot the coloured Spec-
CrUMI. For I eried che lame Experiment ich ocher Prilms
rich che same succels. And parcicularly wich a Prim
wrtrich seemed Erec From such Veins, aud ihose retractins
Angle ras 62 Dcorees, I Found che lenoch of che Image 93
or 10 Tuches ac che distance of 18= Feec trom che Prism
the breadch of che hole in che Windon- Phuc being = OF an
Tnch as betore. And because ic iS Ca(C EO COMMIE 2 mi-
Aakce in placing che Prilm in ies due polture, I repeated
the Experiment tour or tire cimes, and alvars Found che
lenoch ot the Image chac ihich is sec down abore. Wich
anocher Prism oF clearer Class and betrer Pollistr, which
scemed trec trom Veins and irhole retractins Angle was
63: Deorees, che lenoch ot this image ac che lame diltance
oF 18 = Feet as al(o aboue 10 Inches, Or 103. Berond
chele Mlealures for abour ? Or ? ot an Inch ac cicher end oF
the Spectrum the Lighe ot che Clouds scemed ro be a licele
tinged rich red and riolet, buc lo verr tainely chac I suspe-
eted thac rincture mishe cither whollr or in great mealure
arise trom Lome Rays ot the Spectrum scaccered irre-
oularly by some inequalicies in che substance and Polist
oF che OlaIs, and cheretore I did noc include ic in chele
Nealures. Nom the disterent Magnicude ot che hale in
cheWindo-Phur, and differene chicknels of che Prilm Wwhere
ehie Rars passed chrough ic, and different inclinations of che
Prim eo the FTorizon, made no sensible chanoes in che
lenoch ot che Image. Neicher did che differene macter ot
ehe