Ring and Ball Apparatus with Stand Glass Bottles_BOD Bottles Demonstrates electromagnetic switching on a

Demonstrates electromagnetic switching on a base with 4mm plug connections

Nine-piece flat brass weight set with dual hooks on each piece

fabricated from glass tubing 6 mm bore

8mm inner diameter

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

Ring and Ball Apparatus with Stand Glass Bottles_BOD Bottles Demonstrates electromagnetic switching 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.