371186r
[Commentary:
This page is part of Harriot's
experiments on refractive colours. On this sheet, Harriot considers his third and fourth guesses for the secondary cardinal (made on
f. 187, 'E') in the glass prism; his calculations show that the 'good cardinal' should be chosen at a point equidistant between the two. ]
F
In triangulo bde. per 4 cardinalem.
[Translation: In triangle , by means of the fourth cardinal. ]
In triangulo bde per 3 cardinalem.
[Translation: In triangle , by means of the third cardinal. ]
[Translation: In triangle , by means of the fourth cardinal. ]
In triangulo bde per 3 cardinalem.
[Translation: In triangle , by means of the third cardinal. ]
4tus cardinalis 39° 41â² deficit
3us cardinalis 39° 42â² excedit.
Ergo bonus cardinalis 39° 41â² 30â³ υ 6386559.
[Translation: The fourth cardinal 39° 41â² falls short.
The third cardinal 39° 42â² goes too far.
And so the good cardinal is 39° 41â² 30â³, the sine of which is 6386559. ]
3us cardinalis 39° 42â² excedit.
Ergo bonus cardinalis 39° 41â² 30â³ υ 6386559.
[Translation: The fourth cardinal 39° 41â² falls short.
The third cardinal 39° 42â² goes too far.
And so the good cardinal is 39° 41â² 30â³, the sine of which is 6386559. ]
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