This is the only one of Leonardo da Vinci's inventions that was  actually turned into a working model during his lifetime.
This is the only one of Leonardo da Vinci's inventions that was  actually turned into a working model during his lifetime. A firing  mechanism for small guns, it is cocked by winding the namesake  metal device inside the trigger, locking it into place. FTP, name  this device that is named partly because of its appearance, similar  to a doorknob's mechanism, and partly because of the spinning metal  disk that creates the required spark.
This is the only one of Leonardo da Vinci's inventions that was  actually turned into a working model during his lifetime.
{wheellock}