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

with both 4mm stackable sockets and screw terminals so leads wire in without an adapter to either bench standard

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

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

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.