Leonardo da Vinci designed a crane with a rotating platform and a counterweight for lifting heavy loads.
Leonardo studied cranes as part of his broader work on machines, construction, and military engineering. His drawings show mechanisms that combine a vertical support, a projecting arm, ropes, pulleys, and counterweights. Some designs also include a rotating base, allowing a load to be moved horizontally after it had been raised.
The counterweight was important because it balanced the load and reduced the effort needed to operate the machine. Pulleys changed the direction of force and could provide mechanical advantage. These principles were not invented by Leonardo, but he analyzed and reorganized them with exceptional clarity in his notebooks.
Leonardo did not invent the crane itself. Ancient Greeks and Romans had already used cranes, and medieval builders continued to improve them. His contribution was the study and refinement of mechanisms, including portable and rotating crane forms. The exact drawings differ, so “crane” is the broad machine category rather than the name of one single standardized model.