697. Opposite Domains Between Like Domains

Shabbos 13:16

If a person throws an object from one private domain to another, he is not liable. This is so even if the item passes through a public domain that is in-between the two private domains. This applies when the object travels more than three handbreadths above the ground (about nine inches). If the item passes within three handbreadths of the ground and comes to rest on something else, the one who threw it is liable even if the thing continues to move and ends up in the second private domain. In such a case it is considered as if the object had stayed in the public domain so the person is liable. Similarly, if a person throws something from one public domain to another public domain with private domain in between them, he is not liable. If the object passes within three handbreadths of the ground and comes to rest on something, he is liable even if the item continues into the second public domain. It is considered as if the item had stayed in the private domain, so he is liable.

Shabbos 13:17

A person is liable if he carries something more than four cubits (about six feet) from one public domain to another. The total four cubits is made by combining the distance he traveled in both public domains combined because the item did not come to rest in the private domain that lies between them.