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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 7, page id 1677894601:0179
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=179
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this Fourth Circuit there was neither riolet, blue, nor
vellorr, and the red vas verr impertect and dirtr.
AICO the Succcedins C olours became more and more iim-
perfect and dilute, tiII AFTCF THECC OE FOUF RevoluTiONS
cher ended in pertect irhitenels. Pheir Form, Wrhenthc
Glastes ere most compresed (0 a5 to make the black
Spot appear in the Center, is delineated in the Second
LIBUTC; Where a, b,C, d, e: f, 8, h, i, k: l, M, nn 0, P: 9, r: F15. 2.
5, t: V, X: y denote the Colours reckned in order trom
the center, Black, blue, irhite, vellorr, red: violet,
blue, srcen, relloir, red: purple, blue, sreen, vello,
red: green, red: sreenittr blue, red: greenittr blue,
Pale red: greenitt blue, reddittr erhite.
OBS. V.
To determine the interral oF che Glases, Or thick
nels oF the interjacent Air, by erhich cach Colour was
produced, I meatured the Diameters ot the APA AX
Rings at the most lucid part ot their Orbits, and squa-
rins them, I Found their Squares to be in the Arith-
metical Progression ot the odd NumBCES, L. 3. 5. 7. 9. TI.
AndAnce one et these GElasses ras Plain and the other
Spherical, their Interrals at thole Rings must be in the
Pame Progrestion. I measured also the Diameters ot
the dark or Faint Rings Becreen the more lucid Co-
lours, and Found their Squares eo be in the Arithme
tical Progression of the eren NUMBeES, 2. 4. 6, 8, 10, 12.
And it beinq very nice and difficule to take these mea-
Tures exactly; P repeated them at dirers times at dirers
Parts oF the Glasses, that by their AOrcement I mioHE
be contirmed in them. And the tame Method I used in
deter-