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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 52, page id 1677894601:0062
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Fxper. 12. In the midale of a black Paper I made 2
round hole about a ftch or sixch parc ot an Tnch in Dia-
meter. Upon chis Paper I cauled che Spectrum ofHlomo-
geneal Lighe described in the Former Proposition, (010
fail, chac Come parc of che Lighe mishue pals chrouch che:
hole of che Paper. This transmitred parr of che Liohe l
retracted rith a Prilm placed behind che Paper, and ler-
cing chis retracted Lighe tall perpendicularly uxon a whice
P’aper erro or chrec Feet distant trom che Prism, I Found
chac che Spectrum Formed on che Paper by chis Liohe ras
noc oblone, a5 irhen eis made (in che chird Experiment)
By Retractins ehe suns compound Liphe, buc was ((0 Far
25 I could judsc by my Fyc) pertectlr circular, thelenoch
being no oreacer chan the breadch. Which Phens chac this
Lighe is retracted regularly ichout an Dilaration of the
Ray5.
Exper. 13. In che Hlomogeneal Liphe I placed a Circle
oF: ot an Tuch in Diamecer, and in che suns unretracted
Hlecerogencal Wrhice LigheI placed anocher Paper Circle ot
chelame bignels. Andgoinstromthe Paperstochedistance
oFlome Feet, Ivieved boch Circles chrouoh a Prism. The
Circle illuminate d by thesun sHleterogeneal Lighe appear-
ed rery oblone as in che fourch Experiment, che lenoch
being many cimes orcater chan che breadth: buc che ocher
Circle illuminated wich Hlomogeneal Lighe appeared Cir-
cular and distinctli defined as when eis vierred wich che
nakced Fyc. Which proves the whole Proposition.
Exper. 14. In che Homogeneal LigheI placed Flies and
Tuch like Minuce Objects, and vicwins chem chrough a
Prism, I Pa cheir Parrs as distinetly defined as it Phad
riemedchem rich che naked Ere. Phe lame Objects pla-
ced in che suns unretracted Flererogeneal Liphe ihich as
nhire l viered also chrouoh a Prism, and Pam them most
contuledly