Aepinus Capacitor Electrostatic Demonstration Apparatus Capacity_50mL Sturdy wooden pulley simple-machine model

Sturdy wooden pulley simple-machine model with multiple pulleys mounted in series and parallel

Adjustable mass on one fork shifts its 440Hz pitch by a few hertz

Used to seat E10 miniature-Edison-screw bulbs in circuit experiments

Wood-handled collecting net pairs a sturdy grip with fine mesh netting for classroom field trips and introductory entomology collection work

Rod-mounted full-size skeleton pairs bare bone on one side with painted muscle origins and insertions on the other for skeletal and myology teaching

Aepinus Capacitor Electrostatic Demonstration Apparatus Capacity_50mL Sturdy wooden pulley simple-machine modelAepinus capacitor with adjustable plates demonstrates electrostatic principles, capacitance, and electric field physics in classroom experiments.