Electrostatic Pompon Set Light & Optics_Spectroscopy Square die-cast alloy boss head

Square die-cast alloy boss head with metal thumbscrews

letting students measure rotational distance against linear advance to derive the mechanical advantage of the spiral

Enlarged mandible model exposes lower jaw teeth

Diamond lattice kit with 39 carbon atoms and 60 connectors for building the tetrahedral covalent network that gives diamond its exceptional hardness and optical properties

Parallelogram-of-forces apparatus on a 26 by 20 inch wall-mountable board with two clamp-on pulleys

Electrostatic Pompon Set Light & Optics_Spectroscopy Square die-cast alloy boss headPair of nylon fringed metal pompons on insulated stands that fan into wide cones under mutual repulsion when charged, dramatizing Coulomb repulsion and charge distribution on conductors.