1013.

If it be not reported there that this is to be a public canal, it will be necessary to pay for the land; [Footnote 3:  il re.  Louis XII or Francis I of France.  It is hardly possible to doubt that the canals here spoken of were intended to be in the Milanese.  Compare with this passage the rough copy of a letter by Leonardo, to the "Presidente dell’ Ufficio regolatore dell’ acqua" on No. 1350.  See also the note to No. 745, 1. 12.] and the king will pay it by remitting the taxes for a year.

Estimates and preparatory studies for canals (1014. 1015).

1014.

CANAL.

The canal which may be 16 braccia wide at the bottom and 20 at the top, we may say is on the average 18 braccia wide, and if it is 4 braccia deep, at 4 dinari the square braccia; it will only cost 900 ducats, to excavate by the mile, if the square braccio is calculated in ordinary braccia; but if the braccia are those used in measuring land, of which every 4 are equal to 4 1/2 and if by the mile we understand three thousand ordinary braccia; turned into land braccia, these 3000 braccia will lack 1/4; there remain 2250 braccia, which at 4 dinari the braccio will amount to 675 ducats a mile.  At 3 dinari the square braccio, the mile will amount to 506 1/4 ducats so that the excavation of 30 miles of the canal will amount to 15187 1/2 ducats.

1015.

To make the great canal, first make the smaller one and conduct into it the waters which by a wheel will help to fill the great one.

Notes on buildings in Milan (1016-1019)

1016.

Indicate the centre of Milan.

Moforte—­porta resa—­porta nova—­strada nova—­navilio—­porta cumana—­barco—­porta giovia—­porta vercellina—­porta sco Anbrogio—­porta Tesinese—­torre dell’ Imperatore—­ porta Lodovica—­acqua.

[Footnote:  See Pl.  CIX.  The original sketch is here reduced to about half its size.  The gates of the town are here named, beginning at the right hand and following the curved line.  In the bird’s eye view of Milan below, the cathedral is plainly recognisable in the middle; to the right is the tower of San Gottardo.  The square, above the number 9147, is the Lazzaretto, which was begun in 1488.  On the left the group of buildings of the ’Castello’ will be noticed.  On the sketched Plan of Florence (see No. 1004 note) Leonardo has written on the margin the following names of gates of Milan:  Vercellina —­Ticinese—­Ludovica—­Romana—­Orientale—­ Nova—­Beatrice—­Cumana—­Compare too No. 1448, 11. 5, 12.]

1017.

The moat of Milan.

Canal 2 braccia wide.

The castle with the moats full.

The filling of the moats of the Castle of Milan.

1018.

THE BATH.

To heat the water for the stove of the Duchess take four parts of cold water to three parts of hot water.

[Footnote:  Duchessa di Milano, Beatrice d’Este, wife of Ludovico il Moro to whom she was married, in 1491.  She died in June 1497.]