Tirari and alzari are Italian terms used in the Late Medieval and renaissance periods for vertical and horizontal traction systems: cranes, column raisers, obelisk movers, winches, tackles, etc.., all of the “engines” that an engineer had to know in his profession.
The book "Tirari e Alzari" traces the history of cranes from antiquity to Renaissance, providing a key to combining philological interpretation and engineering analysis. Leonardo da Vinci is a focal point: his manuscripts constitute some of the most important testimonies of these machines’ history for their innovation and for his studies of other engineers’ solutions, such as the spectacular crane models from those he studied on the construction site of Filippo Brunelleschi’s dome of the Florence cathedral.
Tirari e Alzari exhibits some of the primary models of cranes and weight positioning systems that inﬂuenced the development of these technologies.
Each model is the result of a philological study which starts from sources, their historical location and, passing through a careful engineering study, arrives to one or more of reconstruction hypothesis of the machine; it is presented through a physical model made considering the techniques and materials of the time, 3D models and animations.