Demonstration Compass Science at Home large enough for whole-class visibility

large enough for whole-class visibility when tracing magnetic field lines around bar magnets

the moderate curvature spreading light gently for divergence and virtual-image-formation work in refraction demos

Double-concave glass lens at 3-inch diameter and 200mm diverging focal length

the standard configuration for keeping the field intact between classroom magnetism sessions

Hand-crank centrifuge spins four 15mL tubes for teaching sedimentation

Demonstration Compass Science at Home large enough for whole-class visibilityFive inch demonstration compass with a 4 inch magnetic needle and a printed compass map, sized so the needle stays readable from the back of the room.