Facsimile (Giunti, Florence 1974); ca. 1490-99; 21x15 cm
This is one of the manuscripts whose recovery in 1966 caused a sensation. The manuscript, composed of 192 leaves, is divided into two parts. The first part contains drawings and notes relating to a series of elementary mechanisms. The second (the first in chronological order of compilation) contains research on theoretical mechanics. This is the most accurately paginated of Leonardo's manuscripts that has survived.
fols. 44v-45r: Stretching device (left); spring mechanism for a clock (right).
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