Quotation from: The Notebooks of Leonardo Da Vinci

Written by: Leonardo da Vinci

The canal of San Cristofano at Milan made May 3rd 1509. [Footnote:
This observation is written above a washed pen and ink drawing which
has been published as Tav. VI in the _,,Saggio."_ The editors of
that work explain the drawing as _"uno Studio di bocche per
estrazione d'acqua."_]

1010.

OF THE CANAL OF MARTESANA.