397199r
[Commentary:
This page is part of Harriot's
experiments on refractive colours. As Harriot wrote on
f. 190, the 58° glass prism he used for his first experiments was irregularly shaped, and the observations were 'not to be trusted'. Most likely this is the reason that he recalculated, over two pages, the colour-producing cardinals for a regularly-shaped, 60° glass prism, using the same method as in the earlier pages on prismatic colours. ]
A2. De coloribus per angulum vitreum
[Translation: On colours through a 60° glass prism ]
[Translation: On colours through a 60° glass prism ]
Numeratio per primarios cardinales.
Numeratio per cardinales
[Translation: Calculation for primary cardinals.
Calculation for secondary cardinals. ]
Numeratio per cardinales
[Translation: Calculation for primary cardinals.
Calculation for secondary cardinals. ]