Th gif below on the sewing machine helps too
Think of it like a rotating door. It lets you through from one side to the other, but there's never a direct opening from inside the building to outside. It works because you pass into a chamber and the chamber itself moves around. There is never an opening from one side to the other at the same time.
( , Thu 21 Aug 2014, 10:30, Share, Reply)
Think of it like a rotating door. It lets you through from one side to the other, but there's never a direct opening from inside the building to outside. It works because you pass into a chamber and the chamber itself moves around. There is never an opening from one side to the other at the same time.
( , Thu 21 Aug 2014, 10:30, Share, Reply)