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first object, being at a distance of 4 braccia from your eye will
diminish to 3/4 of its height at that plane; and if it is 8 braccia
from the eye, to 7/8; and if it is 16 braccia off, it will diminish
to 15/16 of its height and so on by degrees, as the space doubles
the diminution will double.
1
01.
Begin from the line m f with the eye below; then go up and do the
same with the line n f, then with the eye above and close to the 2
gauges on the ground look at m n; then as c m is to m n so
will n m be to n s.
If a n goes 3 times into f b, m p will do the same into p g.
Then go backwards so far as that c d goes twice into a n and p
g will be equal to g h. And m p will go into h p as often as
d c into o p.
[Footnote: The first three lines are unfortunately very obscure.]
1
02.
I GIVE THE DEGREES OF THE OBJECTS SEEN BY THE EYE AS THE MUSICIAN
DOES THE NOTES HEARD BY THE EAR.
Although the objects seen by the eye do, in fact, touch each other
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