367184r
[Commentary:
This page is part of Harriot's
experiments on refractive colours. Summary of Harriot's analysis of colour experiments with glass and water-filled prisms. The large diagram shows the geometrical construction for the 58° glass prism, and throughout the pages on both the glass and the water prism, this construction and its associated lettering are implicit. Despite the title and the depiction of the glass prism, Harriot's summary here includes the water prism. The pair of "cardinals" he discovers for each substance ("vitri cardinales" and "aquae cardinales") indicate, in effect, the range of refractive indices that direct light passing through these substances towards either the red or yellow. ]
De coloribus per prisma/angulum
[Translation: On colours through a glass prism/angle. ]
[Translation: On colours through a glass prism/angle. ]
nigredo
rubedo
flavedo
[Translation: Blackness. Redness. Yellowness ]
rubedo
flavedo
[Translation: Blackness. Redness. Yellowness ]
post novas et multas iteratas observationes
ita invenimus
[Translation: After many repeated observations, these are the cardinals I found. ]
ita invenimus
[Translation: After many repeated observations, these are the cardinals I found. ]
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