To make an Automatic Siphon.
Take a single piece of glass tubing and with the help of a Bunsen burner, bend the tube into the shape indicated in the diagram. Allow it to cool. When the bent part is inserted in water the siphon will immediately start flowing. The siphon can also be made with a plastic drinking straw. The straws, cut to the proper lengths can be joined with adhesive to make the siphon.