Ring and Ball Apparatus with Stand Glass Bottles_BOD Bottles Nine-piece flat brass weight set

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

wheel-and-axle

Combining filtration and titration on one base

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

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

Ring and Ball Apparatus with Stand Glass Bottles_BOD Bottles Nine-piece flat brass weight setStand 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.