Lung Demonstration Apparatus

This device uses a bell jar to represent the thoracic cavity, a rubber dam as the diaphragm, a Y-shaped tube as the trachea and bronchial tubes, and two balloons as lungs.
Manipulation of the diaphragm causes the balloons to inflate and deflate.
Lightweight, break-resistant plastic bell jar may be handled safely by the entire class.
Overall dimensions, 11 x 5 x 5 in.