Scholars and students in the history of science, hydraulics, mechanics, architecture, art. SHORT TEXT: All the secrets of Leonardo's manuscripts and drawings, clearly explained and illustrated by 3-D pictures. INDEX OF CONTENTS: Presentation (Prof. Paolo Galluzzi, Director, Istituto e Museo di Storia della Scienza, Florence) - Introduction (Domenico Laurenza) - Introduction (Mario Taddei and Edoardo Zanon) - Figurative Index - 001: Flying Machines - 002: War Machines - 003: Hydraulic Machines - 004: Work Machines - 005: Theatrical Machines - 006: Musical Instruments - 007: Other Types of Machines - Bibliography