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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 50, page id 1677894601:0060
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=60
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about che centh part ot an Iuch, and ies heiphe an Inch Or
MOTC. For by this means, if che Axis of che Prism be
Parallel co che Perpendicular of che Triangle, thelmage
18. 23. pt will non be Formed oF Fquicrural Prianeles a5, bB, c1,
dk, et, fm, ecc. and innumerable ocher intermediare ones
anliverins co che Triansular hole in Chape and bignels, and
Lring one atcer anocher in a continual Scries Between EwO
Parallel Lines a f and 5 m. These Frianoles are a lietle
interminoled ac their Bases buc nor ac cheir Verrices, and
cheretore che Lighr on che brighrer sde af ot che Image
irtiere che Bales oFthe Friangles are is a licele compounded,
buc on che darker side z m is altogether uncompounded,
and in all places becireen che sides the Composition is
Proportional co che distances of the places trom thac ob-
scurer Cide s m. And harins a Spectrum pF oF such 2
Compolition, e mar ery Experiments cicher in its Aronger
and less simple Lighe near che side af, or in ies meaker
and simpler Lixhe near che ocher side lm, as ic Call scem
most conrenient.
Buc in makins Experimenes of chis kind che Chamber
oucht to be made as dark as can bc, least anr Forreion
Lighe mingle ic selt rich che Lighe oF che spectrum pt,
and render it compound; especially it re mould ery Lx
perimenes in the more simple Lighe nexe the side e m ot
che Spectrum; which beins fainter, will have a lels Pro-
portion co che Forreion Lishe, and (0 by che mixture ot
chac Lighe be more troubled and made more compound.
The Lens allo ouphe to bc g00d, such as may serre For
Optical Ules, and che Prism oughe to have a larre Angle,
suppose of 70 deorees, and to be well iroueht, beins
made ot Class tree trom Bubbles and Veins, wich ies sides
noc a licele Conrex or Concare as ulually happens bue
eruly Plane, and irs pollich elaborate, as in workins Oprick-
slacles.