Writable and Erasable Terrestrial Globe Subcategory_Skeletons sized to stack on a

sized to stack on a vertical rod for like-pole repulsion levitation demonstrations

the longest focal value in the 50mm convex line giving the gentlest divergence and largest virtual image

this battery box adds insulated terminals and prevents short-circuits from rolling cells touching exposed lab metalwork

supplied with a jockey and heavy-duty 4mm socket terminals for null-deflection EMF work

accepting rods up to three-quarters of an inch for positioning apparatus at any angle

Writable and Erasable Terrestrial Globe Subcategory_Skeletons sized to stack on aWritable and erasable 12 inch globe with blank land masses and printed warm and cold ocean currents, encased in a half circle meridian ring for hands on geography mapping.