/ · The Notebooks of Leonardo da Vinci

101

The apparent size of objects defined by calculation.

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.]

Taken from The Notebooks of Leonardo da Vinci edited by Jean Paul Richter, 1880.