Ring and Ball Apparatus with Stand Glass Bottles_BOD Bottles Mounted Zener diode on a

Mounted Zener diode on a transparent base with 4mm color-coded sockets and a printed circuit diagram

8mm inner diameter

Demonstrates electromagnetic switching on a base with 4mm plug connections

Shows oxygenated and deoxygenated blood paths between heart chambers and alveolar surfaces through seven hand-painted removable parts designed with medical-professional input

wheel-and-axle

Ring and Ball Apparatus with Stand Glass Bottles_BOD Bottles Mounted Zener diode on aStand mounted ring and ball thermal expansion apparatus, dropping freely through the ring when cool but stopped by the ring once flame heating expands the ball.