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as they recede, I will nevertheless found my rule on spaces of 20
braccia each; as a musician does with notes, which, though they can
be carried on one into the next, he divides into degrees from note
to note calling them 1st, 2nd, 3rd, 4th, 5th; and has affixed a name
to each degree in raising or lowering the voice.
1
03.
PERSPECTIVE.
Let f be the level and distance of the eye; and a the vertical
plane, as high as a man; let e be a man, then I say that on the
plane this will be the distance from the plane to the 2nd man.
1
04.
The differences in the diminution of objects of equal size in
consequence of their various remoteness from the eye will bear among
themselves the same proportions as those of the spaces between the
eye and the different objects.
Find out how much a man diminishes at a certain distance and what
its length is; and then at twice that distance and at 3 times, and
so make your general rule.
1
05.
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