715. More About Projections from a Wall

Shabbos 15:6

Continuing from yesterday’s halachos, if neither the upper nor the lower projection is four handbreadths by four handbreadths, they may both be used. In such a case, one may use the entirety of the wall except for the ten handbreadths closest to the ground. If the lower projection was four handbreadths by four handbreadths, but the upper one was not, one may only use the part of the upper that is adjacent to his window. One may not use the parts of the projection that extend to the sides of the window because the lower projection, which is a separate domain, restricts its use.

Shabbos 15:7

When a projection extends over a public domain and is permitted for use, one may only put on it and remove from it earthenware and glass vessels or similar such things that will break if they fall into the public domain below. Neither more durable utensils nor food may be put there because if they fall into the public domain, one may end up retrieving them and bringing them into the house.