Experiment 22. A submarine battle.
Make a second submarine, place it in a large bottle with the first submarine, turn the bottle on its side, and make the submarines manœuver by moving the stopper in and out.
FIG. 36
FLARING A TUBE
Finally arrange them so that they are on the bottom, facing each other bow to bow, two or three inches apart (1, Fig. 35), and release the stopper quickly. Do the submarines try to ram each other (2, Fig. 35) in a most realistic manner?
FIG. 37
AN AIR GUN