self-moving

If it were not so, why does one call a horseless carriage 'automobile' instead of 'self-moving carriage'?

His water-clock, self-moving vehicle, and mill, were the wonder of the village; the latter propelled by a living mouse.

It was also for Plato the self-moving and the cause of all motion.

The world consists of a finite number of atoms, which have in their own nature a self-moving force or principle.

But if this be true, must not the soul be the self-moving, and therefore of necessity unbegotten and immortal?