Battery Box, Model C Capacity_50mL Hard vulcanized ebonite rod that

Hard vulcanized ebonite rod that takes on a strong negative charge when rubbed with fur

Shows oxygenated and deoxygenated blood paths between heart chambers and alveolar surfaces through seven hand-painted removable parts designed with medical-professional input

sized so the heavier D cell stays seated when student-built circuits are picked up

and major vessels of the human heart

and optic nerve

Battery Box, Model C Capacity_50mL Hard vulcanized ebonite rod thatUsed to enclose dry cells safely for student built circuits, this battery box adds insulated terminals and prevents short circuits from rolling cells touching exposed lab metalwork.