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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 13, page id 1677894601:0023
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3
Ineroduction eo Readers oF quick Wir and g00d Under-
standins noc vec versed in Opticks: Althouoh thole who
are alread acquainced u s setene, anare
handled Classes, will more readily apprehend what Fol-
eesect.
PROP. I. ThCOr. I.
IOHITS which difter in Colour, difter allo in De-  ot
srees ot Retrangibiliey.
The Proos by Fxperiments.
Exper. 1. P cook a black oblone siff Paper terminated
b Parallel Sides, and with a Perpendicular riohe Line
draun crols trom onc Side co che other, distinguished ic
into erro equal Parts. One ot chele Parrs I painced wich
a red Colour and che other wich a bler. The Paper was
verr black, and che Colours incense and chickly laid on,
chac che Phaenomenon mighe be more conspicuous. This
Paper I riered chroueh a Prilm oF solid Olals, Whose tvo
Sides chrouoh which che Lighe passed co che Eye vere
plane and ell polisted, and concained an Angle oF abOuE
Sixer Dcorees: Wrhich Angle Icall the retractine Angle ot
che Prilm. And Whilst I viered ic, I held ic betore a
Windor in such manner chac the Sides of che Paper ivere
Parallel co chePrism, and boch chose Sides and che Prism
Parallet co che HTorizon, and the crols Line perpendicular
co ic; and thac che Lighe wrhich fell trom che Window
NIDOM
Garen
u