-: MAKING AND CONTROLLING A DIVER :-

A diver is a person who explores the underwater world by diving. Divers explore the oceans, lakes and rivers by taking deep dives under the water. They make use of diving suits, breathing tubes, etc. Divers do many important jobs such as studying plant and animal life at the bed of the sea extracting minerals, or even saving people from drowning.

Materials

• Take an empty glass bottle with a tight-fitting cork. If the cork is dry and rigid, leave it in the water until it becomes flexible, so that it can be pushed down into the mouth of the bottle.
• Take a flat plastic sheet and draw the outline of the diver. The sheet should be thin enough to fit into the glass bottle.

• Use scissors to cut the diver to shape.

• Take a small piece of the plastic tube from an old ball-point pen. Seal one of its ends with modeling clay or plasticin. The other end should remain open.
• Glue this tube to the diver with the adhesive. The air in the tube will make the diver float.

• Wind some wire around the diver’s feet. The weight of this wire will make it stay upright in the water. Use enough wire to make the diver sink.

• Put the diver in the glass bottle and fill the bottle with water.

• Push the cork into the bottle. This increases the pressure in the water and some water finds its way into the plastic tube. Consequently, the diver sinks.
• Pull the cork a little out of the mouth to make the diver rise. With a careful adjustment of the cork, the diver can be made to stop at any depth you want.
• By the pressure command of your finger, this model diver will move up or down in the water. You can even make the diver hover at any depth.