Reproduction of the car designed by Leonardo da Vinci in 1495
It is an automobile that is running around all around the world, but that leonardo da vinci was also designing a car that moves with a springwork in 1495. It is very difficult to move at a constant speed if it is a springwork, but by combining very elaborate gimmicks it is possible to run at a constant speed while being a springwork.
So, let's see the movie in which the reconstructed Leonardo da Vinci's car runs.
YouTube - Leonardo Da Vinci Automovile (1495)
In addition, there is one that reproduced this mechanism in Shockwave on the following page. It is messed up.
"L'automobile" di Leonardo da Vinci 1478 * -2004 **
Perhaps the one who said it was a scientist rather than an artist is correct.