| 896 | 897 | 898 | 899 | 900 |
| 1 | 306 | 613 | 919 | 1225 |
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the pressure of wind which strikes on it with more or less
swiftness. This is in Battista Alberti [Footnote 25: LEON BATTISTA
ALBERTI, De Architectura lib. V., c. 12 treats 'de le navi e
parti loro', but there is no reference to the machine, mentioned by
Leonardo. Alberti says here: Noi abbiamo trattato lungamente in
altro luogo de' modi de le navi, ma in questo luogo ne abbiamo detto
quel tanto che si bisogna. To this the following note is added in
the most recent Italian edition: Questo libro e tuttora inedito e
porta il titolo, secondo Gesnero di 'Liber navis'.].
Battista Alberti's method which is made by experiment on a known
distance between one island and another. But such an invention does
not succeed excepting on a ship like the one on which the experiment
was made, and it must be of the same burden and have the same sails,
and the sails in the same places, and the size of the waves must be
the same. But my method will serve for any ship, whether with oars
or sails; and whether it be small or large, broad or long, or high
or low, it always serves [Footnote 52: Leonardo does not reveal the
method invented by him.].
Methods of staying and moving in water
1
114.
How an army ought to cross rivers by swimming with air-bags ... How
fishes swim [Footnote 2: Compare No. 821.]; of the way in which they
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