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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 78, page id 1677894601:0254
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=254
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# Lines: 31 recognised, mean confidence 0.90
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C
cothe polition and distance oF the Farth From the SuM.
The mean motions ot Fupiters Satellites is allo tritter
in his descent From his Aphelium to his Perihelium,
than in his accent in the ocher halt oFhis Orb: But this
inequalitr has no respect to the position of the Farth,
and in the three interior Satellites is insensible, as I And
by computation trom the Theory oCtheir sravier.
ERO P. XII.
Lvery ray of Lieht in ils passare throush any refra-
ctine surface i5 put into a certam transient constitution
or state, rehich in the prooress of the ray returns at
equat intervals, and disposes the ray at every return
1o be casily transmitted throuoh the next refractine sur-
face, and betreeen the returns to be easily reflected by
it:
This is manifest by the gth, oth, 12th and PGtM OB.
Terrations. For Dy thole Oblerrations it appears, that
one and the Pame Port ot rars at equal Angles ot inci-
dence on ary thin transparent plate, is alternatelr reAe-
Ated and transimitted For manz succections accordinely.
a5 the chickness oF the plate increases in arithmetical
prosreltion oF the numDers O, 1, 2, 3, 49 5, 6,7, 8,dc.
To that if the Arst resexion (that vrhich makes the AeA
or innermost ot the Rings oF Colours there described)
Demade atthe thickness L, the cars Pall be transmitted at
the thickneses 0, 27 4, 6, 8, 10, 12, 8c. and thereby
make the central Spot and Rings oF Light, irhich ap-
pear by transmission, and be reflected at the thicknels
2375, 7, 9, TI, 15c. and thereby make the Rings irhich
appCaI