Leonardo da Vinci was a great artist. But he was also a prolific designer, engineer, architect and philosopher. Currently on display at the Air and Space Museum in San Diego are sixty precise and interactive replicas of his creations and concepts in flying machines, watercraft and mechanical devices that were hundreds of years ahead of his time. One of the outstanding museums at Balboa Park is the Air and Space Museum. www.aerospacemuseum.org ·
Da Vinci envisioned tools, weapons, war machines, self-propelled cars, robots and ball bearings in addition to his concepts for flying machines and improved watercarft. .jpg)
He offered his services and devices to the king and other authorities to help defend his country. Several of his inventions were actually war machines such as a tank with wheels and covered top to protect the men and cannons inside www.aerospacemuseum.org/visit/index.html

For the common man and workers Da Vinci invented jacks, mechanisms for lifting heavy weights, pulley systems, ball bearings, chain driven tools, drills, excavatiing machines, cranes, differentials and the flywheel. .jpg)
Variations of his wall scaling device is used by rock climbers today. Worm screw mechanisms, roller bearings, three ball bearings, hydralic saws and drills and improvements on the Archimedes water screw were other inventions.
A robot that could open and close it's jaw, sit up, wave the arms and move the head was built for the entertainment of guests. A candle night clock could actually record the time as the candle burned.
Several of Leonardo's best known paintings are reproduced and hung in a vestibolo d' arte obtained from a Hollywood Paramount studio set. This display is attractive and well done, as is the entire Da Vinci exhibit. 
The descriptions of the inventions and concepts are clear and precise and easy to read. Each invention is well constructed and several can be handled and tested to better understand the design.
It is amazing to see these devices and inventions in models with descriptions that explain the thoughts of Da Vinci. What a mind and what insight Da Vinci had in so many areas. He is credited with conducting dissections of many adult and embryo corpses and accurately drawing the muscles, bones and organs. Da Vinci also seemed to understand the fossilization processes and developed an early version of the plate tectonics theory that was not understood fully by most modern scientists until the 1950s. Da Vinci had an incredibly active and productive mind.