Internal Gear and Pinion Drive Mechanical Demonstration Model Glass Bottles_Aspirator Bottles with alphanumeric position labels and

with alphanumeric position labels and a stacking design for organized molecular-biology workflows

Jointed Liebig condenser in borosilicate glass measures 16cm with 14/23 glass connectors for distillation and reflux procedures

and workshop tasks

used to demonstrate standing waves in air through powder-pile node spacing measurements

Internal Gear and Pinion Drive Mechanical Demonstration Model Glass Bottles_Aspirator Bottles with alphanumeric position labels andHand cranked internal gear and pinion between two clear plastic plates, with dual rotation dials for quantitative analysis of gear ratios and rotary motion transmission.