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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 25, page id 1677894601:0197
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B)
sereral obliquities ot the rays; by the asistance oF the
Ath, 24th, Ibth and 18th Obserrations, a5 they aic
hereaster explained, I collect the thickness of the Water
requisite to extibit any one and the lame Colour, at le-
veral obliquities, to De very nearly in Fhe PrOPOrtION
expresed in this Table.
Incidence on) Refraction in- (Thictness of
the Water. 10theWrater. The W ater.
des. min. des. min.
00 00 00 00
15 00
II
30 00 23
45 O0
22
60 00 40
75 00 46
90 001 48
2
C
10
In the trro Arst Columns are expressed the obliqui-
ties ot the rays to the luperticies oF the Water, that
15, their Ansles ot incidence and retraction. Where
lsuppole thac the Sines irhich mealure them are in
round numbers 25 3 t0 4, thoushi probably the disso.
lution oF Soap in ehe Water, may a lictle alter its
refractire Vertue. In the third Column the thicknels
oF the Bubble, at Wrhrich any one Colour is exhibited
in those sereral obliquities, is exprest in parts, of irhieta
ten conltiture that thickenels irhren che raYS are perpen-
diculat.
Thare Pometimes observed, thac the Colours wtrict
arise on polisted Sceel by heatins it, or on Bell. metal,
and some other metalline substances, when melted and
 C
pourect