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Pam, Section 19 does not contain a table, the table is for observation 7 in Section 20... However, here are the first two lines of said table, as I'm pretty sure you're going to read a bit further
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Angle of Inc. on the Air. Angle of Refr. into the Air. Diam of the Ring. Thickness of the Air.
Deg. Min. Deg. Min.
00 00 00 00 10 10
06 26 10 00 10-1/13 10-2/13
Please read it like this:
Angle of Incidence on the Air zero degrees, zero minutes. Angle of Refraction into the Air zero degrees, zero minutes. Diameter of the ring 10 Parts, Thickness of the Air, 10 Parts (*).
Angle of Indicence on the Air 6 degrees 26 minutes. Angle of Refraction into the Air 10 degrees, zero minutes. Diameter of the ring 10 -1/13th parts. Thickness of the air 10-2/13 parts.
Angle of Incidence.....
Meaning, for every row please repeat the column headers at the appropriate place so that we know where we are when listening. Do this for every table you come across.
(*) The parts come from directly below the table, where he says: In the third Column the Diameter of any colour'd Ring at those Obliquities is expressed in Parts,... Although it is not mentioned in table proper, I think it should be added to make it a bit clearer to the listener (10 WHAT???)