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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 19, page id 1677894601:0029
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=29
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the most conrenient, ie is eo be understood thac all che Prisms
are placed in che follorinu Experimenes, untels where lome
ocher polture is described. The Prilm cheretore beins pla-
ced in chis posture, I lec the retracted Liphe Fail perpendi-
cularty uxon a Steet oF irhice Paper ac the opposItE W aIL
ot the Chamber, and obserred che Figure and Dimensions
OF the Solar Imase Formed on the Paper by chac Lipht.
Phis Image wras Oblono and noc Oral, bue cerminared
rich vo Rectilincar and Parallel Sides, and cvo Sermi-
circular Ends. On ies Sides ic was bounded precer distinctr,
buc on ics Fnds very contuleds and indistincly, ehe Lighe
chere decaxins and vanistns by deorees. The breadch ot
this Imase anlivered co che Suns Diameter, and iras about
erro tnches and the cioheh pare oF an tnch, including che
Penumbra. For thelmage iras ciphreen Fcet and an halt
distane from che Prism, and ac chis distance chac breadch it
diministred by che Diameter oF che hole in che W indo-(BUE,
chac is by a quarcer oF an Inch, subcended an Angle ac che
Prilm oF about halt a Deorec, ertrich is che SuInS apPareHE
Diamecer. Buc che lensch ofthe Image was abouc ren Inches
and a quarrer, and che lenoch of che Rectilincar Sides about
eiohe Inches; And che retractine Anele ot che Prilm wrhere-
by (0 great a lenoch vas made, ias 64 deor. Wich a lels
Angle che lenech ot the Image was lels, che breacth re
mainins che Came. IF che Prilm as turned about its AZIS
thac War irhich made che Rays emerse more obliquolY Out
et ehe second retractinq Surtace ot the Prilm, che tinase loon
became an Inch or ermo longer, or more; and il che Prilim
as turned about the concrarr may, (0 as eo make che Ra75
fall more obliquely on the first retracting Surtace, chelmage
Coon became an Tuch or ero Phorrer. And cheretore in cry
ino chis Experimene I as as curious as I could be in pla-
cing che Prilm by che aborementioned Rule exactly in
TuC