Land-Measure Units and a Water-in-Sunlight Experiment
Conversions of pertica, tavola and trabocco, with a rayed sun and a toothed ring drawn above
Turned upside down, a block of notes converts Italian land measures: the pertica equals 1855 small squares, 24 tavole make one pertica, and 4 and 1/2 braccia make one trabocco. The same block closes with a small experiment - blow a spray of water from the mouth into the orb of the sun and watch whether its first impact shifts position. Above the text Leonardo draws a rayed sun and a circular crown crossed by diameters.
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Blow water into the sun's light and watch the first impact
A short experiment closes the note: blow water from the mouth into the sphere of the sun and observe whether its first percussion changes position or not. A small rayed sun, captioned Sole, is drawn at the upper right to accompany the trial.
Conversions between pertica, tavola and trabocco
The note fixes a chain of land measures: one pertica is 1855 small squares, 24 tavole make one pertica, and 4 and 1/2 braccia make one trabocco. The figures read as working conversions between the units.
A circular crown crossed by diameters
Above the writing Leonardo draws a circle captioned as a circular crown, its interior crossed by diameters and its lower edge notched. The figure is set beside the small rayed sun.