Triple-Parallel Plastic Pulley, 50mm Diameter Subject_Zoology and control strips for a

and control strips for a fuller genetic-taste-perception activity

this Van de Graaff generator delivers spark-producing high-voltage demonstrations in the physics classroom

producing oxygen's characteristic emission lines for spectroscope viewing of atomic-emission and quantum-energy levels

this motor-generator pairs a split-ring commutator against slip rings with bulb indicators

Triple-Parallel Plastic Pulley, 50mm Diameter Subject_Zoology and control strips for aTriple parallel plastic pulley with three 50mm wheels on a steel frame with end hooks, supporting three rope compound arrangements for advanced mechanical advantage investigations.