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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 49, page id 1677894601:0059
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=59
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Experimene; and chese Circles are equal eo che Circle L,
and conlequenely ansirer in Magnicude ro the holef; and
cheretore by diministrins chac hole chey max be ac plealure
diministred, uhilst cheir Centers remain in cheir places.
By chis means I made the breadth ot che Image pF eo bc
Forer cimes, and Cometimes sixtr or serener times lels than
ies lenoch. AsFor instance, it the breadth ot che hole F
be i oF an Tuch, and MIF che distance of che Lens From
the hole be 12 Fece; and it pB Or pMI che distance ot
the Image pt Fromthe Prilm or Lens bC 10 Feet, and che
retractins Anole ot the Prilm bc 62 dcorees, the breadch
Ofche Image pF wili be= ot an tuch and the lenoch abouE
SixInches, and cheretore che length eo the breadth 25 72
co1, and by consequence the Lighe of this Image 71 times
less componnd chan the Suns direct Lighr. And Lighe
chus Far simple and Fomogencal, is sutticient For erving
aIl che Experimenes in chis B00k about simple LiohE. FOr
che composirion of Hlecerogeneal Rays is in this Lighe (0
licele thac ic is scarce eo be dilcorered and perceired by
sense, excepe perhaps in the Indiso and Violet; For thele
beins dark Colours, do casilr sulter a senlible allar by chat
lictle scarrering Lighe which ules to be retracte d irreoularty
by che inequaliceis ofche Prilm.
Tet instead ot the circular hole F, eis berrer to sybsti-
cure an oblone hole Phaped like a lone Parallelogram
wich ies lenoch Parallel eo the Prism ABC. For it this
hole be an Tuch or ero lono, and buc a centh or erventieth
part ot an lnch broad or narrover: che Lighe oF chelmage
PF Wrill be 25 Simple as betore or simpler, and che Image
Will become much broader, and cheretore more Ac to have
Experiments cried in ies Liohe than betore.
Instead oF this Parallelopram hole may be substicured a
Friangular one ot equal Sides, whose Base For instance is
abOut