Fall of the Martigiana canal and a river-bed depth note
A canal gradient, a sighting device, and a river-bed profile, in red chalk and pen
In pen, Leonardo notes that the canal of Martigiana falls two ounces for every 100 trabocchi (equal to 450 braccia) and observes that a river reaches its greatest depth after the current, where the water grows still; a red-chalk profile of a river bed accompanies the note. A small sighting scheme labelled a and b carries the caption that a 'teaches you to measure' b. A separate jotting records a preparation of sap and fig latex 'to dissolve'.
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Fall of the Martigiana canal and the depth of rivers
The canal of Martigiana has a fall of two ounces for every hundred trabocchi, which equal 450 braccia. Leonardo adds that the greatest depth of rivers lies after the current, where the water becomes still.
Sighting scheme: 'a teaches you to measure b'
A small diagram is labelled b a. Its caption states that a teaches you to measure b, describing a sighting or leveling device for taking a measurement.
Recipe: sap and fig latex 'to dissolve'
A brief memorandum records a preparation of the sap of the whole [maglio] together with fig's milk (latex), noted 'to dissolve' [something].
Profile of a river bed
A red-chalk drawing shows the profile of a river bed. No accompanying inscription was transcribed for this figure.