375188r
[Commentary:
This page is part of Harriot's
experiments on refractive colours. Calculation of refractions of rays passing through the glass prism. Part of the working here relies on the 'secondary cardinal', which Harriot determines only on f. 185 ('G'). The crucial value, brought in from G, is towards the bottom of the page: 0° 49â² 58â³ 58â´]
D. De coloribus per prisma vitreum.
[Translation: On colours through a glass prism. ]
[Translation: On colours through a glass prism. ]